69 Firebird rear bumper on a 68

[Ishmael]

The 68 Firebird rear bumper is a little bulky, not that a 69 isn't , but its a little smaller. I won't be cutting up any bumpers anytime soon so I was thinking of putting a 69 on my 68. Has anyone done this. I've googled it - nothing. Has anyone done it? How different are the brackets? Any pics?
thanks guys