E30 Zone

might be bit of a silly question but im not sure of the answer..
im ordering an lowering kit on wednesday probly a 60mm kit but the question is will i need the 51mm or 40mm struts my car is a g plate 325i

also any advice on a kit around the £200 mark would be great

thanks for any help an sorry if ive posted a silly question

51mm mate.

thanks very much for that i thort it would have been but wanted to make sure