factory 4L80E/241 adapter. i took it off my 4L80E, and it doesnt match up to my round 205, so im assuming its for a 241. ill post pics up so you can see. $100 + ride
plus that way ill still be able to use the "4L80E/203" adapter you machined for me 
79k20350 said:and where did you find a wms 3:1 box? And even if you do find one would it be more cost effective to go black box?