I'm looking at bilstein hd b6 inserts and they come in two sizes, 30 and 36mm. What size fits the early struts better (If the 36 fits at all)? I found a killer deal on the 36mm ones but I just want to make sure they'll fit first. I've got strut housing from an '86(I had remembered after I made the title, still with gland nut on housing) I believe in my 85.5 I'm out of town in business or else I'd tear apart my struts and mic the id. Thanks!