Front Hub Grease Caps '34

[Doran Johnson]

I have found a pair of front hub grease caps for my '34 PE but the price seems to be out of line.  Does anyone know what readily available grease cap from a parts store would fit the '34 front hub.  I have been told that the diameter is easy to match, but the depth needed to cover the retainer nut is not.  My parts book is not with me now, but as I recall the original part number is 600183. 

Thanks,  Doran