New Isoflex gear guard coupling IC-6150-95Gearbox flange Bolt circle diameter 4.75"Gearbox flange bolt size 16mmGearbox flange index ring pilot type - MaleGearbox flange index ring pilot diameter 3"Isoflex coupling outside diameter 6.3"Isoflex coupling inside diameter 2.36"Isoflex coupling thickness 1.5"Fits 5.75" 6-Bolt FlangeTwin Disc MG506-1, 506-1A, 506, 506SC,5061,5061A, 5061V, MG507, MG507A-1 w/ 6" Flange MG5050A, 5050SC, MG5061A, 5061SC, 5062VZF 80A, 85, 85IV, 280IV, 280-1, 280-1A, 285A, 285IV,2861V, 301A, 301C, HSW800A2, HSW800A3, 220, 280A, 280, 300TS, 300-1TS, 300ATS, 300-1ATS, 300VTS, 110ATS, 110IVTS, 220PL, 280V-LD, 280PL, 301PL-2, 301A-2Newage PRM 1000Technodrive TM130B, TM260, 265AYanmar/Kansaki KMH60VCross reference Drive Saver 5756BPoly Flex 656 (95), 616-5/8 BoltsR&D 910-006 (isoflex is thicker by .37") , 910-026 (isoflex is thicker by .46") , 910-033 (isoflex is thicker by .68")Supplied with coupling and bolt kit