driveline and u-joint/rear yoke question

I have a driveline that has the correct slip yoke for the trans. The yoke on my 8 3/4 rear end doesnt have tabs/bungs to self center the rear u-joint, the straps were gone when i got it. The front and rear u-joints are the outer retainer clip type, i cant use the inner retainer type on the rear driveline side due to the casting contour of the yoke, What do i need to do to ensure the rear u-joint is going to be centered? This seems to be fall out from combining a variety of parts, can i make it work? thanks in advance.