Going through my Group N parts lists and also trawling the realoem site I think I made a connection, with the help of Turner.
Take a look at these part numbers and descriptions. The OD thread of the PSS9 from Bilstein is M52X1.5 (Turner confirmed this for me). But the PSS9 uses springs from Bilstein (Eibach?) which have a very small lower diameter, similar to a coil-over (probably for tire clearance) and the top is standard diameter, to fit in the stock upper perch.
However, looking through realoem, there is a "spring pocket" to only be used in conjunction with "threaded ring M52X1.5". I believe that this spring pocket is the lower spring perch and the threaded ring is used to secure the perch to the PSS9 strut.
Left Strut, M3 (Group N) adjustable* 31.31.2.501.111 1 $976.50
Right Strut, M3 (Group N) adjustable* 31.31.2.501.112 1 $976.50
*POSSIBLY Bilstein PSS9 set up for stock springs, which would be used with the following:
Spring Pocket (lower perch) 31.33.2.222.879 2 $110.94
Threaded Ring (M52X1.5- same as PSS9) 31.33.2.200.014 2 $72.65
The diagram shows the "spring pocket" as the rubber isolator for the spring in the standard strut, so it is confusing...
Turner could not confirm the "spring pocket" is in fact the lower perch. Buying these (non-returnable) parts to test them seems risky, but what do you guys think?
I had asked Turner prior on the BMW part numbers for the struts t see if they crossed to the PSS9 and Turner could not find any information on that unfortunately. If they could, that would put it to bed I think.
Take a look at these part numbers and descriptions. The OD thread of the PSS9 from Bilstein is M52X1.5 (Turner confirmed this for me). But the PSS9 uses springs from Bilstein (Eibach?) which have a very small lower diameter, similar to a coil-over (probably for tire clearance) and the top is standard diameter, to fit in the stock upper perch.
However, looking through realoem, there is a "spring pocket" to only be used in conjunction with "threaded ring M52X1.5". I believe that this spring pocket is the lower spring perch and the threaded ring is used to secure the perch to the PSS9 strut.
Left Strut, M3 (Group N) adjustable* 31.31.2.501.111 1 $976.50
Right Strut, M3 (Group N) adjustable* 31.31.2.501.112 1 $976.50
*POSSIBLY Bilstein PSS9 set up for stock springs, which would be used with the following:
Spring Pocket (lower perch) 31.33.2.222.879 2 $110.94
Threaded Ring (M52X1.5- same as PSS9) 31.33.2.200.014 2 $72.65
The diagram shows the "spring pocket" as the rubber isolator for the spring in the standard strut, so it is confusing...
Turner could not confirm the "spring pocket" is in fact the lower perch. Buying these (non-returnable) parts to test them seems risky, but what do you guys think?
I had asked Turner prior on the BMW part numbers for the struts t see if they crossed to the PSS9 and Turner could not find any information on that unfortunately. If they could, that would put it to bed I think.
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