R1 shock on a Series 1

[oioivespaboy]

I'm sure I can remember reading somewhere that a R1 shock needs spacers to fit a S1 or S2.
I tried searching but came up with nothing.
Could anyone tell me some sizes of packers I need?

Many thanks

[shocky]

they sometimes need turning the other way up so the res is on the top if you need spacers 20mm washers do the job and there cheap contact me if you cant get any