If you can save your belly band then go for it. There should be wood inbetween the two halves to screw back into, I think it is a 1 x 3 of pine. My belly band was is bad condition, so we are going to fiberglass the two halves together eventually. We had a lot of water come in through the belly band and we don't want that happening again.
The jacks I use are from Princess Auto, here's a picture of them from their website.