Looks like I stand corrected.........that is one deep axle!! Yes, Highboy 32 is right, they are '49-'54 Chevy spindles, probably that have been machined to accept later disc brakes. Speedway sells disc setups for these, assuming yours are machined to the same size. A quick check with a tape measure and calipers will tell you what size they currently are.

It doesn't look like MAS has a current website, but they do have this:

http://www.mdra.com/carshow/mas.html

Don