OE Coil spring confusion

[Morrison]

I’m in the process of completely refurbishing the rear suspension on my 2003 3.0i which I believe to have been equipped with sport suspension from the factory because the VIN crosscheck says “sport suspension settings” and it came with the 18” wheels, sport 3 spoke steering wheel, black headliner, black shadow line, yada yada. Well as part of refurbing all the rear arms, ball joint, and bushings, I also ordered new rear springs, part number (33-53-6-750-351).

As I pulled out the old springs, I noticed the part number was different, (33-53-6-750-352). I measured the old springs at 15.5 mm diameter wire. The new springs measure 16.0mm. So I’m not sure if the factory put in the wrong springs or if I’m attempting to put in wrong springs. The new springs are about 3/8” taller but the old springs have 195,000 miles on them, so I’d expect some fatigue. This got me curious about the rear sway bar and front springs. I measured the rear bar at 23.5mm which I think is consistent with the sport suspension. I measured the front springs at 16.7mm but I don’t know what the official sport front springs should measure. Anybody know?