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In the Amazon link in posts #10 and #11, and... https://www.radwell.com/en-US/Buy/PARKER%20FLUID%20CONNECTORS/172HD42 (min 10 ea.) http://www.lesman.com/acatalog/Parker-Hi-Duty-Brass-Fitting-172HD.html

I just checked the price on a new one... thought they were brass, but they're priced like gold ($35-$40). Hopefully eastern/C&C surplus/Boyce Equipment, etc. can help you out...

Yep, my brain went directly to flame heater line Tee... but I believe the links above may help for the injector Tee.

Complements of Frank8003... http://ph.parker.com/us/en/brass-flareless-tube-fitting-hi-duty/172hd-4-2/#tech-specifications From this thread on return line fittings... https://www.steelsoldiers.com/showthread.php?127786-M35a2-injector-return-line-fittings

All the injectors are the same, and they'll only fit-up one way. Especially since you just got em tuned, shouldn't make any difference which goes where. I'd suggest you anneal the copper washers that seal them to the heads before reinstall (if you haven't bought new ones). Also, a 12 gauge...