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Morning Steve
I've measured everything and can't find any differences in measurements. The strut top centre hole is equal too.
When I come to fit the shocks it'll be interesting to see if I rotate them if there'll be any difference.
Seeing that others have noticed the same, with shocks not sitting central on the strut top hole, what could be the reason I wonder.
Today being a slightly nicer day, i've been out hunting and measuring and what i've found is this:-
Car 1, This I have called my "control", it's a low mile and largely original 74 Toledo, the shox and springs are in the sort of shape you'd expect from OE. NEITHER shock stud is central in the hole, both are equal fore and aft but both are displaced slightly outboard of central by the same amount, perhaps 3mm
Car 2, My modified 1500FWD has GAZ ASP Shox and Sprint springs built up by me for the Carledo originally. The o/s/f pin is displaced forward slightly, maybe 2mm and the n/s/f is displaced rearward maybe 3mm, but both appear to be within 1mm of central in the inboard/outboard plane.
Car 3 My modified Sprint auto, has new, but original spec, standard springs and shox, the O/S is one of a pair bought built up from Ian (Sprint 95M) and the other has the spring from Ian's pair with a new Unipart shocker and a different (used) topmount that I built up myself when the original shocker of the pair from Ian failed. The pin displacement on this car is exactly the same as on Car 2, o/s forward, n/s back and by similar amounts.
I've also checked the 2 topmounts I could easily find and my results match yours, I can find no obvious assymetry, either in stud or hole spacing beyond the + or - 1mm here and there that I would regard as manufacturing tolerance.
So still, I dunno! the results would indicate that though there is no noticeable assymetry in the topmounts, there IS a difference somewhere and it's theoretically possible, with a lot of faffing, to make them match, side to side, though not necessarily to be exactly central in any case. Whether it's worth the effort, is probably up to the individual, I can't see much point, seeing as it has no effect on how the cars drive (all 3 cars above drive fine) You, with your higher attention to concours detail, might feel otherwise!
As to a reason, I can only offer the possibility that the hole in the strut top isn't consistent car to car. Not sure if I can be bothered to measure this! But if this is the case, you will know, as your efforts at rotating the topmount will have no result if the error is in the shell! So i'll wait till you've tried this!
Steve