Making this way harder than it needs to be. Rotor is an early 90's Chevrolet 1/2 ton truck but the bore needs to be opened up to about 4.2" to fit over the axle flange. Visit a junk yard and pull the front calipers, pads, soft line, bolts, and the last few inches of hard line including the fitting from a late 80's to early 90's GM car front. Find one in good condition with good pads and roll with it if you can. If not, exchange the calipers for loaded calipers at any parts store for cheap....
Look at the top of the page and read up on the conversion on the tech forum. It's really not that hard. In fact, I'd say it is easier than keeping the non- self adjusting rear drum brakes set up properly.
If you want to repair your current system you should plan on ordering both wheel cylinders for that wheel as well as new brake shoes. You would be better off to go ahead and buy some drum brake tools to help you do the work (if you can still find them),and also find a shop to turn your old drum on their brake LATHE. Once you get it all back together you can enjoy a few hours of fighting with a adjustment tool on both the top AND bottom cylinder until you get each one adjusted properly( good luck with that).
Mike, give me a call or run me down at SL and I will walk you through it. That's all I'm willing to type with one finger on this damn IPhone.
