From home depot get a 3$ thing of 3/8" flat stock. Harbor freight or the like, a 5mm bolt, short. Drill holes in the stock. If you think ahead you can have a front and rear in one tool, end for end.
Retainer usually have 4 dimples, use 1/8 drill bit and just get down in a bit, not super precise.
I replaced the outer seal but it was a real pain in the d!ck. Rammed an awl in there to budge it up