you would still use the stock strut, that is how you get your lift.

50 mm is 2 inches longer, so it would be the same as adding the 2 inch spacers. which i think is a 4" lift. i was going to get these if i could get ahold of them, and then build all my dif drop brackets and drop the lower control arms and have the knuckles modded to have a big ifs lift.

but gave up on that after a few months of trying to get ahold of them.

2000 SPORTY, DEF BOY customs, mmm....lockers, mmm... gears, mmm... double transfer case, mmm... stroker
http://www.cardomain.com/ride/2377991