I replaced both sides on my 54. the left side went in with no problems other than having to modify the top to bottom curve with a rubber mallet. Once in place you may have to move the side flanges in or out to get the best fit. It will not be perfect but you can use seam sealer to fill any gaps as I did.
The right side was a challenge in that I had to section the inner-to-outer panel to get it to fit in the available area. This may be because I had installed the lower outer cowl prior to this and it may have been off slightly.
I have some pics of my repairs on my picture trail albums and others I can send you if you need them.
Never think that any patch panel will fit directly into your repair without some tweaking.
