Coilover kits- round hole or D shaped?

[Supercharged Nat]

Im thinking of doing a coilover conversion on my capri, its running 2.0L struts and Gaz inserts. do i need the kits with a round hole or D shaped hole in the topcup?

 

From memory (i think) the original spring cup has two flats that the insert rod goes through (so the insert rod turns with the outer strut).

 

what has everyone else used?

 

Oh and while im here, what poundage and length springs should i use? currently im at -2" 170lb springs (if that helps at all).

[Supercharged Nat]

anyone?

[escort21]

I got the round hole ones and machined them out to fit the damper

[escort21]

16mm hole and 12mm across flats

[BIG G]

D ones are for bilstiens i thinks