that master cylinder is the same style used by the majority of RWD cars and trucks thru the 70's and early 80's...I'm betting they're giving you the gasket for the newer style plastic reservoir type master cylinder, if its square. Ask them if they have one for a 79 fullsize Chevy truck...the trucks used that same style master cylinder as well... to my knowledge, they never used a plastic reservoir master with hydroboost, only steel.
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Shawn's Auto Repair and Performance, SW Wis.
www.shawnsautorepair.procarcarezone.com
69 Olds Cutlass S
70 Olds Vista Cruiser Wagon
72 Olds Cutlass S, 12:1 470 stroker, JM40 solid lifter cam, TH400, 3500 10" PTC stall, 4.11 posi
74 442 455/TH350
79 Cutlass 455/TH375 sleeper
'97 GMC Sierra Ext Cab 9" lift w/ 37's