Hi all, long time no post...just getting back into the m42 after a long hard slug of study!
i ordered replacement springs, H&R Sport, P/N: 50404... 
the dilemma being that as invoiced and reciprocated on the box is the same part number 50404 depicting H&R -1.25" F/R sport springs, for BMW E30 318is with 
M42 + M-Tech.
open the box and find 50404.55 printed on the springs?, that P/N cross-referenced as the OE sport springs for E30 325i.
having searched all available resources the general consensus is that the 50404.55 are correct for the 318is M-tech, and sit the car at a nice hight, subtly lower.
any one else come across this issue? is it a problem, and have i got the wrong springs?
cheers