also just took out the little "plunger" thing from behind the hex bolt. i have a pic.
its a shaft with a spring and ball bearing in it. no seals on it. just press fit in.
the hex bolt ID for the oring is 17mm.
thickness looks somewhat the same as the other small ones.(about 2mm)
If we are talking metric here(which is ideally the proper size, though the other approximations will work).
Some of these are from another thread.(which apparently have been confirmed)
1 - 2x64x68 (or 2x65x69)
1 - AS568A Dash Number 136 Square Cross Section O-Ring(or maybe 033 square or, 033 round or, 136 round)- unsure (though I think a 2.5x50x55 would work..square or round I cant confirm I one that fits but is 3mm and it just seems a tad big)
1 - 2x24x28
1 - 2x14x18(or 2x13x17)
3 - 2x12x16
1 - Bearing 12x17x40
1- oil seal full dimensions/specs unknown (though measured roughly ID 20mm and OD is about 32mm.)
those or measurements is if you want the play on the inside or outside. probably doesnt matter which one you use)
9 orings total.