if you buy an RE you need a special flange for a front shaft or you have to buy a custom shaft, IRO has a kit with a regular yoke that allows you to use a front shaft.
The yoke alone can be found for under $100. They're just including a junkyard driveshaft covered in paint, with one new u-joint. My u-joint was pressed too tightly so i ended up redoing it anyways...
Basically what i'm saying is, buy the yoke, get a junkyard driveshaft, and save yourself about $60.