I found 3 Purolator oil filters (Pure One PL10111) and a Motorvator (Purolator) MPA-23 air filter for my old Chevrolet K1500. The air filter is about 3-1/2" high and about 9-1/2" outside diameter.
The oil filters fit the GM 2.8, 3.1, 3.2, 3.3, 3.4, 3.8 and 4.3 V6 engines as well as the 1.4, 1.6, 2.3, 2.5, and 2.8 4-cylinder engines.
The air filter fit the TBI 4.3 V6 in the 91 K1500.