Rear bumper question?

Hello, I own a 1970 Challenger. The original rear bumper has seen better days. I have the opportunity to purchase an original straight rear bumper with decent chrome from a 1972 Challenger. Are there any differences between the two? I do not see any slots on the 1972 bumper for the jack mount. To me the two bumpers look identical. Am I missing anything?

Second question, what's the average price these days for a used original straight 1972 rear bumper. The chrome looks good. Not...

Rear bumper question?