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Motive Products Power Brake Bleeder Adapter Late Model GM Cars Trucks Part # 1108 Features Custom cap to fit most late model GM cars and trucks. Fits Cadillac's, Buick's, Chevrolet's, Oldsmobile's,Pontiac's, Saturn's. This kit comes with round 3-tab twist-on adapter (1108) ***Please visit Motive Product's website for specific applications, click on the application guide page for detailed info*** Here is some snippet from Motive's own application guide: (But we still highly recommend that you consult the fitment chart PDF available on the support page on MOTIVE website) Chevrolet/GMC/Buick/Cadillac/Pontiac/Olds (GM) Prior to the 2000MY most GM products used a rectangular or oval shaped cap on a wide mouthed reservoir. From the early 70s to mid 80s the reservoir was metal, after that time period it was plastic. If the reservoir is less than 3.75" x 6" the 1105 adapter will be needed which comes with kit 0105, if larger than 3.75"x6" the 1115 adapter in kit 0115 will be needed. In the late 90s GM began switching to a round twist to lock cap across all product lines. The cap twists 1/4 turn and has 3 locking tabs on the underside. Cars with this type of adapter will use Power Bleeder p/n 0108 or the Black Label 0118. The corresponding adapter would be the 1108 or the metal version 1118. The G8/SS primarily uses the adapter 1117. But the 1118 has been seen- The GTO has seen the 1117(id 2"), 1118(id 1.98") and a select few that use the 1105 adapter. Note some Saturn cars use a different cap. Saturn Most Saturns use kit 0108/0118 which include the 1108/1118 adapter. The 1108/1118 is a twist to lock cap used on most GM products. However some Saturns use the European type cap which is a threaded female cap with an inner diameter of 45mm. If your Saturn has the threaded female cap then you will need kit 0100/0109 which include adapters 1100/1109.