The following Auster models are approved for the fitting of the windmill generator in the stbd inner leading edge. J1, J1B, J1N, J4, J5, J5B, J5F, J5G, J5H, Mks 4 & 5. Mod 1678 is for the fitment of an AT157/3 three brush genny and Mod 2340 is for the fitment of an AT153/R regulated genny. Your middle panel looks like a scratch built and would be for a set of circuit breakers. Most Austers would have been fitted with the 5C/445 “Pirates chest” fuse box for single circuits or an 8 way 5C/761 for multiple circuits.