Adjusting distance of two decorative ornamentals at the top of the page

Question

I'm trying to reproduce the preface page ornament design of the Westlake's How to write letters book. This is a capture of that page with the decoration:

In doing so, I've used the pgfornament package, from which I selected a pair of ornaments so I can join them to reproduce that antique ornament. Here is the code:

\documentclass[10pt,letterpaper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lipsum}
\usepackage[object=vectorian]{pgfornament}

\begin{document}
    \begin{center}
    \fbox{\parbox{95mm}{
            \begin{minipage}{50mm}
                \begin{minipage}{1mm}
                    \pgfornament[scale=0.5]{55}
                \end{minipage}%
            \hspace{45mm}
                \begin{minipage}{1mm}
                    \pgfornament[scale=0.5]{56}
                \end{minipage}
            \end{minipage}
    }}
    \end{center}\vspace{20pt}

\begin{center}
    {\LARGE\sc Some title}
\end{center}
\lipsum[1-2]

\end{document}

This is the result:

However, I do not know how to adjsut automatically the distance between the ornaments. Every time the scale or the ornament number is changed, the distance has to be adjusted manually changing the value of \hspace{}. Also, the \parbox{} size gives the same trouble when those features are changed.

Could anyone help me to fix that in order to get this things sorted out automatically or more efficiently?

---

Note. I think the package tikz would help, but I'm not sure how to use it. All I know about tikz is summarised in the next code:

\fbox{\parbox{98mm}{
    \begin{minipage}{50mm}
        \begin{minipage}{1mm}
            \begin{tikzpicture}
            \node[rotate=0] (a) {\pgfornament[scale=0.5]{55}};
            \end{tikzpicture}
        \end{minipage}\hspace*{\fill}%\hfill%\hspace{55mm}
        \begin{minipage}{1mm}
            \begin{tikzpicture}
            \node[rotate=0] (b) {\pgfornament[scale=0.5]{56}};
            \end{tikzpicture}
        \end{minipage}
    \end{minipage}
    }}

The latter produces the former problems but quite similar results:

Answer 1

The pgfornament package has a width option, where one can define how much horizontal space a decoration will take.

Using that, and streamlining your example, I could produce a couple of pages looking something like this--

with something like this piece of code:

\documentclass[10pt,letterpaper]{article}
\usepackage{lipsum}
\usepackage[object=vectorian]{pgfornament}

\begin{document}
    \begin{center}
    \fbox{\parbox{95mm}{
              \hfil
            \pgfornament[width=45mm]{55}%
              %\hfil
            \pgfornament[width=45mm]{56} }}\\[20mm]
    %
         {\LARGE\scshape Some title}
    \end{center}
\lipsum[1-2]

\clearpage

    \begin{center}
    \fbox{\parbox{95mm}{
              \hfil
            \pgfornament[width=45mm]{46}%
              \hfil
            \pgfornament[width=45mm]{46} }}\\[20mm]
    %
         {\LARGE\scshape A new title}
    \end{center}
\lipsum[1-2]

\end{document}

where \hfil nicely arranges a pair of decorations (each of width=45mm) inside the \parbox{95mm}.

We may choose [not] to use the interim \hfil if we [do not] want a space between the two decorations. The first page does not, while the second does use the intermediate \hfil.

Edit

When compiling in Overleaf, I am getting a space in-between the two decorations (as the OP comments), even if the first one ended with a %.

The package option inner sep=0pt mentioned in p.12-13 of the manual used within a tikz node can be an option to rescue in this case.

Also note the symmetry=v option which adds the freedom to mirror any decoration without the necessity to have the specific pair in the library.

\documentclass[10pt,letterpaper]{article}
\usepackage{lipsum}
\usepackage[object=vectorian]{pgfornament}

\begin{document}
    \begin{center}
    \fbox{\parbox{95mm}{
              \begin{center}
        \begin{tikzpicture}
          \node[left,inner sep=0pt]  at (0,0)  
             {\pgfornament[width=40mm]{55}};%
          \node[right,inner sep=0pt] at (0,0) 
             {\pgfornament[width=40mm,symmetry=v]{55}}; 
        \end{tikzpicture}
              \end{center}}}\\[20mm]
    %
         {\LARGE\scshape Some title}
    \end{center}
\lipsum[1-2]

\end{document}