While Steve is correct, I thihnk we are talking about the "domed" part that extends past the end of the lower a-arm.

I am guessing they may have mis-crossed a part to rebuild from or used a casting that has room for a zerk when there is not room there for one.

Another observation is while that space is close, (and I have almost an extra 1/2" of diameter added to my outer joints, the relationship is such that it does not change during suspension movement.

Got any pictures?

Michael