Hy rust master, I found two listings, depending on whether it has a 5000lb. or 7000lb. front axle
5000lb. axle = BH36697 - o.a.l. 24 13/16", this one has the hex for tightening the connection to the wheel cylinder back from the end
7000lb. axle = BH36696 - o.a.l. 26 3/8", those are Raybestos numbers, hope that helps.
