Will 67-72 stepside fenders fit a 73-87 stepside box?

[Chrysis]

I've looked all over to find a definitive answer, but could not find it.

My stepper has a 73-87 bed on it from the PO. I personally do not like it. I picked up a 67-72 bed that has good fenders for a song, but the rest of the bed is pretty shot. Will the 7-72 fenders bolt directly on to the 73-87 bedsides? Will I need to drill no holes?

If not, the 67-72 bed is repairable. but will require quite a bit of work.

Any info is appreciated.