HD 20/50 engine oil
HD Formula + for the primary case
HD Oil filter pt no 63806-00Y
O ring pt no 11105
Or if you can find it locally.
Torco V series ST 20/50 engine oil
Torco V series Primary chain case lubricant
Black Bear parts will send you the oil filter,and two new o rings for the drain plugs.
01638664455
If you have an earlier model,the manual torque figure for the engine drain plug is a type o and way to high.Should be 14 - 20 ftlbs. 06 model
But far easier is,ride over to Maz who keeps everything in stock,and will only be too pleased to see another fine example of the Buell range.