Available here is a Genuine GM thermo controlled, 3 port vacuum switch in GM box.
This is NOS.
Replaces GM #'s: 1238524, 3016754, 3030975, 413473, 419591
Fits: Chevrolet;
Belair 1968 (307/327/396/427 c.i.d.) 1969 (327/350/396/427 c.i.d) 1970 (350/400/454 c.i.d) 1971 (350/400/402/454 c.i.d) 1972 (350/400/402/454 c.i.d) 1973 (250/350/400/454 c.i.d)
Biscayne 1968 (307/327/396/427 c.i.d) 1969 (327/350/396/427 c.i.d) 1970 (350/400/454 c.i.d) 1971 (350/400/402/454 c.i.d) 1972 (350/400/402/454 c.i.d)
Camaro 1968 (327/350/396 c.i.d) 1969 (307/327/350/396 c.i.d) 1970-72 (307/350/402 c.i.d) 1973 (250/307/350 c.i.d)
Camaro Z28 1968 (302 c.i.d) 1972 (350 c.i.d)
Caprice 1968 (307/327/396/427 c.i.d) 1969 (327/350/396/427 c.i.d) 1970 (350/400/454 c.i.d) 1971 (350/400/402/454 c.i.d) 1972 (350/400/402/454 c.i.d) 1973 (350/400/454 c.i.d)
Chevelle 1968 (307/327 c.i.d) 1969 (307/350/396 c.i.d) 1970 (307/350/402 c.i.d) 1971 (307/350/402 c.i.d) 1972 (307/350/402/454 c.i.d) 1973 (250/307/350/454 c.i.d)
Chevelle SS 396 1968 (396 c.i.d)
Chevy II 1968 (307/327 c.i.d)
Chevy II Nova SS 396 1968 (396 c.i.d)
Corvette 1968 (327/427 c.i.d) 1969 (350/427 c.i.d) 1970 (350/454 c.i.d) 1971-73 (350/454 c.i.d)
Impala 1968 (307/327/396 c.i.d) 1969 (327/350/396 c.i.d) 1970 (350/400/454 c.i.d) 1971 (350/400/402/454 c.i.d) 1972 (350/400/402/454 c.i.d) 1973 (250/250/400/454 c.i.d)
Impala SS 427 1968-69 (427 c.i.d)
Monte Carlo 1970-71 (350/400/402 c.i.d) 1972 (350/400/402/454 c.i.d) 1973 (350/400/454 c.i.d)
Monte Carlo SS 454 1970-71 (454 c.i.d)
Nova 1969-1971 (307/350 c.i.d) 1972 (307/350 c.i.d) 1973 (250/307/350 c.i.d)
Nova SS 396 1969 (396 c.i.d) 1970 (402 c.i.d)