Re: (wanted) 49 F1 Cowl vent panel
48 thru 50 are the same. The 51/52s are the same dimensions and would probably swap, but they are made differently.
48-50 is a sandwich or clam-shell piece made of two pieces with cage nuts inside.
51/52 is a single piece of sheetmetal with a metal bracket to make up for the depth of the earlier one.
Wish I had a picture...........
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