90-91 Burbs and Blazers with the Silverado Trim had the power mirrors. I have them on my Suburban, they use the same mirror head as a 90-95? truck and van...
I found pic of them here:
http://brochures.slosh.com/1990/ctv1-71.jpg
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Chris Lucas
1973 Chevy C-10
1978 GMC Jimmy (2WD) - SOLD
1987 R10 twin turbo LS
1991 R3500 SRW CrewCab
1985 K5 diesel swapped project
1989 K5 2WD conversion w/ Vette susp Project
Captkaos Customs
73-87chevytrucks.com