All the cabs has the provision for them because it was one of those things they had to be in compliance with by X year. I "THINK" is was 80 were they came standard, but I have seen some with them before that. My 78 Burb Didn't have them and my 78 Jimmy HAS them.
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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
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