suspension confusion

[parakeats]

looking on demon tweeks, these two things are identical apart from the number at the top H/R29664-1 vs H/R29663-1

http://www.demon-tweeks.co.uk/performan ... ers-35mm-2

http://www.demon-tweeks.co.uk/performan ... owers-35mm

Would anyone happen to know if any there are different H&R springs for a 318i saloon at this price range? or any website that's a similar price and more informative with what it is exactly? probably coupling with brand new Bilsteins B4's all round - future 6 cyl swap would render spending lots of money a bit silly edit edit - unless it's the same shocks for 4 and 6 cyl? then I may invest in b6/b8?

Many thanks

edit - and how do you tell which springs are oem, sport, supersport etc? seems to be a load of h&r just called "lowering springs"

[DHFiS]

If your car has MTech suspension it will be 15mm lower than a standard car so if you fit these springs you will lower it by only 20mm.

If your car is a standard 318i with 45mm dampers it will not have MTech suspension so these springs will lower it by 35mm.