Spring Perches: Please pick the spring perch diameter that works with the springs you have. Coilover springs typically come in one of three diameters: 2.25", 60mm and 2.5". Ground Control coilovers are supplied with 2.5" dia and TCKline supplied coilovers are 60mm dia springs. KWs coilovers tend to be 60mm but some of these and some Bilstein PSS series coilovers use the OEM upper perch (a tapered spring - see pics below). The 95 M3 and the E30 share the same spring perch.
Radial Bearings: The standard radial bearing is our Double Row Heavy Duty sealed bearing. This is much stronger than the stock radial bearing and what 95% of all camber plate customers use, and should last the life of the car. It is extremely over-spec'd and Vorshlag has never had one returned for repair. There is also an optional Race-duty "short" single row sealed axial bearing that can be used in any Vorshlag upper spring perch (except for Bilstein/Inverted coilover style). The Race bearings replace the double row bearing and are 5mm shorter - effectively reducing stack-up height and adding 5mm more suspension travel (at the same ride height setting). See the pictures below for a graphic illustration of the height difference. It is recommended for race duty only but the OEM perch also had a single row ball bearing in this location. Vorshlag has tested this single-row bearing set-up for 2 seasons of race use on an E36 with 285 R compounds and 18x10" wheels. Lots of abuse, good results, more suspension travel. This is just not a bulletproof street duty bearing like the double row.
Strut Style: Please pick your strut brand and sizes from the drop down below. This helps us build the spring perches to fit your struts with a tight tolerance and no slop - for quiet, reliable use. If you do not know what struts you have please have a reputable BMW shop inspect them, as most mechanics can spot the differences with a quick look. There are also new struts and updates to existing models that come out from time to time. If your strut is not listed, please pick the "Other" option and let us know what brand and model struts you have in the order notes. Note: Koni makes struts for some BMWs with both tapered and square shaft shoulder transitions, so if you have Koni struts please inspect your struts before ordering (or let us know when and where they were purchased, which helps Vorshlag determine what style to build for).