Jamar disc brakes & willwood callipers

[big d chop]

I have a set of Jamar wide 5 disc brakes for a linkpin beam, but the callipers need a rebuild and new pads as they have been sitting on a shelf for ages and I not sure on what condition they are in. I know you can get kits for these but you can bye willwood callipers cheaper than the rebuild kits.
My question is has anyone used willwood two pot callipers with this set up, if so what callipers was they and did you have to get new brackets made of can you use the original ones.