Door Window Hardware

[money pit]

I have a 70 Barracuda. I replace the door glass hardware. There are a couple of window glides I don't know how to install. It's the glides for the lower track. The replacemnets are square, the originals are round. The originals look like they are riveted on the window regulator. I purchased the window hardware kit at Classic Industries. I'm not able to attach  pictures. I will try to retake the pictures. Thanks

[70chall440]

There is another thread on here about the same subject. Also, check out Ebodies.org, some very good info there.