Interior Electronic Switches

[SCOTI]

I lost another switch in my dually.

Since I restored/updated the interior <5yrs now, the window & door lock switches that I used have failed. I purchased re-pop stuff from LMC which I knew was a gamble as far as quality & as expected they failed. But the originals were very rough (as was the entire interior) & I couldn't put beat-up trim on otherwise fresh interior panels.

The pass side door lock switch failed almost immediately. The drivers side failed shortly after. I was able to separate the switch base from the cover portion which allowed continued use of the OE GM switch electronics. Now the main window switch on the driver front door (the 4-position chrome unit) has lost the plastic clips so it won't stay put in the door panel & requires assistance to make good enough contact to work.

I did a Google search looking for LEGIT GM parts but only come up w/more re-pop stuff. Where is a good source for NOS OE switches?