If your current brake assemblies have a 4-bolt mounting pattern then you likely need the Nev-R-Adjust Brake Kit # 23-468-469 (10") for 3,500 lb axles. Since the Brake Kit # 23-464-465 (12") that you referenced has a 5-bolt mounting pattern it will not fit as a replacement for your current brakes.
If you need 12" brakes and you have a 4-bolt mounting pattern then we do have the Brake Kit # 23-105-106-09 but it is manual adjust brakes. view full answer...