Ive built some protoype tubulars but haven't released them yet. You should be able to lay 20s with djm arms the cups may need trimmed. The front also needs Zed to lay 100% flat. There are no ranger drop spindles on the market right now. Alot of people replace the DJM arms with Moog balljoints. Also make sure they are DJM and not chassis tech. I,ve seen several people say they had DJMs old arms but they were actually chassis tech arms and I have no idea if those will lay or not. Hope that gives ya a starting point. Also for more info check out
www.rangerpowersports.com