There is no solution from SRAM if you want a brand new one. You have to get the 12 speed. Its SRAM's only PM to fit a SC BB. You will have to find an older most likely used SRAM PM if you want to keep your current drive train because of the SC BB.
I just had the same exact problem with Quark on my SC. There are other companies that will work but I settled on Stages and it works great. If left/right is important Stages Bilateral.....basically two PM's put together, works just like a crank based PM but cheaper for the entire set up......PM + crankset. But if I remember correctly (?????) the older Quarks were one side power only. If you want a single side power Stages is a much cheaper and very effective PM.
I just had the same exact problem with Quark on my SC. There are other companies that will work but I settled on Stages and it works great. If left/right is important Stages Bilateral.....basically two PM's put together, works just like a crank based PM but cheaper for the entire set up......PM + crankset. But if I remember correctly (?????) the older Quarks were one side power only. If you want a single side power Stages is a much cheaper and very effective PM.