My question is can I use a HD sportster '08 as long as its single phase?
YES
the XL/XR series stator wire(2) length must be slightly modded.
can go OEM XL/XR factory issued stator.....OR....below manufacturers their own stator which is an outstanding piece and competitively priced. Jim was the main contact but that was several years ago. they're in OH and your typical lovely OH folks.
http://cycleelectricinc.com