We do recommend switching over to an 8 on 6-1/2" bolt pattern when adding disc brakes to a 7K axle. All of the 6 lug disc brake kits are going to be rated for 6K and under.
For a full disc brake conversion I recommend the Hydrastar Conversion Kit # HSE7K-T1. This is a complete kit, so you get everything you will need to convert your 7K electric brake axles over to disc. This uses the # 25580 and # 14125A bearings which are basically standard for 7K axles. The only thing you will need... view full answer...