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: Buick;
Apollo 1973 (250/350 c.i.d) 1974-75 (350 c.i.d)
Centurion 1971 (455 c.i.d) 1972-73 (350/455 c.i.d)
Century 1973-74 (350/455 c.i.d) 1975-76 (350 c.i.d)
Electra 1968-69 (430 c.i.d) 1970-76 (455 c.i.d)
Estate Wagon 1970 (350/455 c.i.d) 1971 (455 c.i.d) 1972-73 (350/455 c.i.d) 1974-76 (455 c.i.d)
Gran Sport 1968-69 (350/400 c.i.d) 1970-72 (350/455 c.i.d)
LeSabre 1968 (350 c.i.d) 1970 (350/455 c.i.d) 1971-76 (350/455 c.i.d)
Regal 1973-74 (350/455 c.i.d) 1975-76 (350 c.i.d)
Riviera 1968-69 (430 c.i.d) 1970-76 (455 c.i.d)
Skylark 1968 (350/400 c.i.d) 1969 (350 c.i.d) 1970-72 (350 c.i.d) 1975-76 (350 c.i.d)
Special 1968-69 (350 c.i.d)
Sportwagon 1968 (350/400 c.i.d) 1969 (350 c.i.d) 1970 (350/455 c.i.d) 1971-73 (350 c.i.d)
Wildcat 1968-69 (430 c.i.d) 1970 (455 c.i.d)