I took the donor tubing and these Vintage air tubes to an A/C shop where the two were welded. These V.A. tubes have ports but search the V.A. catalog to see which fit your needs.

12513-VCD Hardline #8 x 12” M/FM U Bend Em
12514 -VCS Hardline #10 x 12” M/FM U Bend Em

I have a pdf of what I did and the parts used so if you'd like it PM your email address.