Go to the HELP parts section of your local auto parts store.
They are black plastic clips that snap into the window track and through the hole in the glass.
https://www.dormanproducts.com/cgi-b...list=1386:98:0
As far as tightening the glass into the regulator goes.....
Remove the door panel and buy a small cheapo Hole saw. Roll the window up to a safe place to drill into the metal, and use the hole saw to make a hole big enough in the metal to slide a socket and extension in to tighten the bolts up.
Obviously, not too tight or you'll break the glass.
Then put the panel and everything back on.