When Volvo changed to the ball joint without the grease nipple they also changed the top wishbone. This means that the non greasable ones generally available will only fit the second type, later, wishbones. Change was with the following chassis numbers(as per parts book) P120 - 193800 P130 - 144400 P220 - 29400 First numbers for new type joint.
Comparing the pics you posted with the ones in the parts book (2 types only) the new left one is the early one and the new one at the right is the later one. Your used one looks to be a half way house and maybe an old type of replacement for the first type that omitted the grease nipple.
Volvo's change to the wishbone may just have been to enlarge the centre hole for the joint by a small amount so that might be an option if you have an early pair.
I like to promote Simon at Brookhouse but have you talked to Mike Dudek at iRoll Moors in Cal? Your side of the pond and a good source.
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