Wheel cylinder.

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Well I lost the one on the drivers side. I'm gonna go ahead and replace both, but I was wondering which size I need to get. I know it has the 1.25" front brakes and I think the rears a 11x2, but I'm not sure. Its a '78 Big Ten/Heavy Half. They list two different ones for the rear, one for the 11x2 and one for a 11 5/32 x 2 3/4. Are the larger rear brakes just a 4x4 or 1 ton deal? I would like to have the parts before I start, b/c I dont like leaving to get stuff while my truck stays up on stands.

Any tips on replaceing them? I found out as I was leaving the driveway yesterday so I didnt drive it far, I just parked it again and drove my S10. All the fluid ran out though between where I was parked and the end of the drivway. I suppose I get the joy of trying to bleed the dang things again.

Thanks
Paul