68C Rear Bumper size
 

Could someone please advise on the proper length of a 68C Bumper?

My old ones, probably originals measure , straight line, outside to outside around 17 inches.

Bratton's slant window 1930-1931 bumpers measure around 20 inches.
Thanks

Re: 68C Rear Bumper size
 

slant window 4 door rear bumpers are only used on slant window 4 doors. not on the 68C they used the same rear bumpers as most 30-31 cars the one you have mounted in the left picture looks correct. also the SW 4 Dr uses longer rear bumper irons or the bumper will hit the fender.

Re: 68C Rear Bumper size
 

The cabby takes the same as coupe/roadster. The slant(sedan and vic) bumpers are longer and with a deeper arch. Yours should be correct as shown.