Most of the parts for a 9 vs 96A & 102A3's will be a different, but not all! We get our parts from several sources.
MCI, C & J Bus Repair (Bloomington, MN), Caylor's Supply Rantoul, KS), Mohawk, US Coach (Vinewood, NJ), International Bus Parts, and more. These are just some of the most commonly used and Busnut friendly ones!
If it were me I'd spring the extra $ and go with rolling lobe bags over the block off plates! Smoother ride, better performance, and about the same amount of time/troble to install! FWIW!