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: Cadillac;
Calais 1968-1970 (472 c.i.d),
Commercial Chassis 1977-1979 (425 c.i.d),
Deville 1968-1970 (472 c.i.d) 1977-79 (425 c.i.d) 1980 (350 c.i.d)
ElDorado 1968-69 (472 c.i.d) 1970 (500 c.i.d) 1977-78 (425 c.i.d) 1980 (350 c.i.d)
Fleetwood Brougham 1967 (429 c.i.d) 1977-79 (425 c.i.d) 1980 (350 c.i.d)
Seville 1976-1980 (350 c.i.d)