All are 5" OD, 1.125" ID, 0.26" mounting holes. All but item 5 have mounting holes on 1.75" bolt circle, Item 5 has mounting holes on 1.635" bolt circle. All are 1/4" thick.
1,2,3 are 33,31,29,27,23,21 holes. #1 has wear around mounting bolt circle.
4,5,6 are 20,19,18,17,16,15 holes. 20 and 18...