what do i have???

[72kool]

im trying to find parts for a rear end rebuild and i do not know what spline count my axles are. the truck is a '72 GMC C25 with the dana 60 rear differential and 4.10 gears. what spline count did these come with? the obvious answer would be to pull the axles and count but i want to get the parts here before i tear into it. also , are there any good seal and bearing kits out there? otherwise i was going to just get what i could from rockauto for good prices. the plan is the replace the axle bearings and seals, check insides for any wear and swap insides for either a powertrax no-slip or spartan locker, and then clean and paint housing. any thoughts or suggestions are welcomed