67-69 cuda fender differences?

hello. I need a fender for my 68 cuda...I found a 69 parts car...it has nice fenders for 200 each...i know the side marker hole is rectangle on 69. what else is different? does everything else change over easily? will i have problems with the '68 headlight assembly and front trim going into the '69 fender headlight bucket? Ideally, I want everything to bolt right in...I need to know ALL the differences before I buy so i know what I'm getting into...

thnaks for you time and help.

-James