Right quarter window replacement
This is an absolutely horrible job and I'm a collision tech that does this stuff for a living.
My guess is that your regulator was slightly bent and pushing on the glass and that's what caused it to explode.
I had the same problem on my 68 Barracuda, minus the broken glass. I can't stress enough that taking out the regulator is a complete pain in the ***, but it does come out once you get everything in the right position.
Putting it back in is just as hard.
I suggest a half case of beer and a pack of cigarettes.
Because even if you don't drink or smoke, you will by the time you are done.