US exhaust "U" bend?

I'm looking for replacements for the 2 "U" bends which go from the outlet of the heads to the heat exchangers (item 35 on the drawing) does anyone know where I could get them?

 

Pretty sure I’ve got some. Let me check.

 

The ones on mine are paper thin at the flanges and leaking.

 

Otherwise weld up some S/S elbows to the old flanges...

 

I think something like this is the best option cheers