3 Point Seat Belt Install

[sixysixss]

I purchased a set of 3 point retractable seat belts for my 66 GMC from Juliano's. I'm getting ready to install them and have some questions for those that have already gone through the process. First, for the retractor that mounts on the floor, did you use the original mounting holes for the lap belts, or does it require new holes, further forward and in line with the seat back? Second, the other end of the retractable belt has to bolt to the L-bracket with the retractor. Does it bolt to the floor side, or the upright side of the L-bracket? Thanks for any help.

Rob