why bother? is the cop on the beat gonna twig on the differences or are ya trying to fool the guy you sell it to?
if you prefer the 55/6 grill you can change it, but there's holes in the 57 surround that'd hafta be filled .... the 55 wheel will fit, but to be in the right position you also need to change to the longer 55 steering column .... many folks prefer the 57 hood and would like to have it for a 55/6
lotta work for no gain - don't matter what the title sez, call it a 57
Bill