The p22 is normally very reliable but not in this case. The picture in the p22 is an 85-86 notice the downward angle toward the front of the engine.
(Assuming you have the same p22 I do) Item 45 is the oil pan (don't know why they only list one number and only picture the 85-86). If you look at item 44 it is the rear seal for the 85-86 only (separate piece from the rest of the gasket) and item 90 is the oil pan gasket (one piece) for 87-88 only
The 85-86
The 87-88
Anyway the confusion is understandable but I guarantee they are different. If you find one with the other pan on it someone has swapped it out. Like I said before either will work as long as you use the matching timing cover.