OK - so I wanna add this MRP chain guide to my 1X9 setup. I am using Truvative Stylo Cranks with a GXP BB. Thing is there is no drive side spacer on the BB. Therefore adding the MRP will throw off the chainline another 2.5mm. Im looking at doing something..... either an XT crankset or maybe just a different BB. The Truvative GXP specs NO spacer for 73mm BB shell which I have. Can I get, say a CK BB, Hawk Racing BB or even a Shimano XT BB? Do the cranks dictate which BB you can use? Much rather replace BB than have to buy a whole crankset to achieve the goal.