sram gxp into bb90 need driveside spacer?

ukracer
ukracer Posts: 421
edited August 2014 in Workshop
Hi looking to fit sram force gxp chainset into Scott addict shimano bb90 (i think) bottom bracket
I've bought the spacer for none drive side now but when I tighten everything up the chainring bolts are rubbing on the chainstay protector.
Do I also need a spacer for the drive side ?
Could someone point me in the right direction please ?