As far as I know all the inserts should be inter changeable except the nuts and diameter of the top that goes through the mount. Boges come with a small shaft and a collar so it fits both varieties here in the US. Difference in body diameter should only effect the volume of oil added to the housing. I always add too much and the extra oozes out upon tightening the collar nut.
I have not heard of an insert not fitting the housing.
95 E34 530I V2.37
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