My '88, '89 and '90 with black bumpers are "A" type, with the plastic trim. The NOS chrome Laredo bumper (in the box) with gray end caps & brackets I purchased from a member does not have the trim. Unfortunately I do not have the box with the manufacture date any longer.
Bumpers with the trim have four square holes on each side for inserts the screws attach to, unlike the non-trim ones, so the bumpers are actually different.