you would have to fabricate a center egg-crate piece; that is, about the onl way i see it possible, is to cut out the middle bar (where the bowtie goes on the '67-'68 grill) and then add in your center piece of choice.

otherwise, as far as just bolting the '71 grill on; nope. the '69 and up fenders have a lip on them for the aluminum grill surround to go over.

maybe GMC fenders? as they're the same shape as the '67-'68 fenders, but have the lip for the aluminum surround?

i dunno. i have no experience with GMCs.

best of luck.

.later days.
.sam.

1969 K20 , with a '67 front clip. fleetside. 292, 3x1 offy, headers. sm465 4spd. getting put back together, almost ready for paint.
doing it all myself.
19 and lovin' it.

"proper" is so over-rated.

.later days.
.sam.