chevy 1500 window motor

has anyone ever replace one of these i cant figure out the clips that keep the motor and regulator from coming out there metal and it looks like the clip goes in the opening where the motor is then a metal object goes in it to expand the clip to make the seal. i dont want to drill these out because the new motor didnt come with bolts to replace it with any help will be greatful thanks in advance850 volvo

10-8" kicker freeair on

old punch 250 p.c.

3 sets of 6.5" 4" 1" mbquarts

bi-amped on 3 alpine mrv-f340

2-jl 6" subs in doorpannel

on old punch 40ix

and running it all

kenwood kdc-x87

On my wifes Grand Am GT I had to drill them out and replace them with bolts. The bolts were  in the box with the motor for her car. '85 Toy