Alright kids, so you can make these fit a 616 by using two end pieces It will take some grinding though, and probably some kind of support welded on the end.
I'll sell the right combo for a 616, but you've got to understand that
it's not a perfect fit and will take some grinding & welding on the bolt holes to make it line up right. Same price for the lego'd 616 assembly as a 617 assembly. Next batch I'll probably get 616-specific flanges made up.
If you want to use these on a 616 I'll be sending you 1.25" flanges as they can be ground to match the gasket. The 1.5" flanges match the 617 so I'll push them that direction.