Seamless T304 grade
available in only one length, 4.4″
the shorter length and full bent lengths in the picture are no longer in production and are sold out
3/16″ OD
5/32″ ID
1/64″ wall
You will need to ream/drill for these to have a final fit into the radiator base or mouthpiece (hole is drilled in base and mouthpiece but is just a little tight for a perfect fit. Reaming is needed)