NEW BILLET SPECIALTIES SBC POLISHED ALTERNATOR & A/C COMPRESSOR BRACKETS, TOP MOUNT, FOR SMALL BLOCK CHEVY SHORT WATER PUMP Brand New Polished Independent Alternator Bracket And AC Compressor Bracket For SBC Short Water Pumps &gt; These Brackets Are Produced By Billet Specialties (Part # 10220 And # 10221) These Brackets Mount The Alternator On The Top Driver's Side, Inside Of The Driver's Side Valve Cover And The AC Compressor On &gt; The Top Passenger Side, Inside Of The Passenger Side Valve Cover &gt; You Can See Where They Mount The Alternator And AC Compressor In The Pictures And Diagram In The Images This Bracket Is For Use With: &gt; Small Block Chevy Standard Heads With &gt; SBC Short Water Pumps &gt; GM 10SI Or 12SI Alternators &gt; These Alternators Were Popular On Numerous GM Vehicles From 1962-1994 &gt; They Have A 2 Bolt Mounting Pattern (One At 12 O'Clock And One At 6 O'Clock) That Measure 168mm (or 6.61") Center-To-Center; See The Diagram Shown Even If You Don't Purchase That Alternator, The Description Lists All Of The Many Gm Vehicles That This Model Was Used On &gt; Sanden 508 AC Compressors &gt; V-Groove Pulleys Billet Specialties Independent Brackets Are CNC Machined From 6061-T6 Billet Aluminum And Polished To A Mirror Finish &gt; They Are Independently Adjustable Without Stabilizer Bars For A Clean Look &gt; Multi-Point Fastening Ensures Stability And Belt Tension