BLAZER/JIMMY (full size) 73-82 4x2
CHEVROLET FORWARD CONTROL 73-80 10 Series
CHEVROLET VAN 73-82 20 Series
CHEVROLET VAN 75-92 10 Series
CHEVROLET VAN 83-92 20 Series; vacuum assist brakes
CHEVROLET 10 PICKUP 73-80 4x2
CHEVROLET 10 PICKUP 81-87 4x2, 1-1/4" thick rotor
GMC 1500 PICKUP 73-80 4x2
GMC 1500 PICKUP 81-87 4x2, 1-1/4" thick rotor
GMC FORWARD CONTROL 73-80 1500 Series
GMC VAN 73-82 2500 Series
GMC VAN 75-92 1500 Series
GMC VAN 83-92 2500 Series; vacuum assist brakes
SUBURBAN 10 73-80 4x2
SUBURBAN 10 81-87 4x2, 1-1/4" thick rotor
SUBURBAN 10 88 4x2
SUBURBAN 1500 73-80 4x2
SUBURBAN 1500 81-87 4x2, 1-1/4" thick rotor
SUBURBAN 1500 88-91 4x2
that's what interchanges, so yes, they do exist.
