These are opposing brackets to set the angle of the trans, One will slide the one side back the other side will slide forward. New sets from Dirty Dingo will only allow either back or forward, depending on which direction you mount the mounts. They wouldn't sell me one of each or an extra one.
The item "DD Chevy V8 adjustable motor mounts" is in sale since Wednesday, March 22, 2017. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Motor Mounts". The seller is "brainquinn" and is located in Rockford, Illinois. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, SE, KR, ID, to Taiwan, ZA, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, PH, SG, to Switzerland, NO, SA, UA, AE, QA, KW, BH, HR, MY, BR, CL, CO, CR, DO, PA, TT, GT, SV, HN, JM.