I am having problems with passenger door lock actuator in 2001 Suburban, but cannot find the actuator anywhere. My original has 3 plugs (evidently number #3 is for anti-theft) but all I find only have 2 plugs. Seems that PN is 16637780. I've struck out on the web and at local parts dealers and junk yards. Stealership wants $250 to replace entire latch mechanism. Any help?