84-85 13B Rx7 Rear Housing to Throttle Body Hose (N304-13-208A) - NLA
 

what are you using to replace this hose since it is no longer available?

84-85 GSL SE 13B Rx7 Rear Housing to Throttle Body Hose (N304-13-208A) - NLA

https://cimg4.ibsrv.net/gimg/www.rx7...ecb1c67320.jpg

https://www.rx7club.com/1st-generati...-hoses-528543/

looks like most stop the water from going to the tb, or replace with a longer regular hose.

i think you could probably get an S4 or S5 NA one, and cut it to make it fit.

i'm not sure its the same diameter, but the Miata 1.6 has a hose a lot like that

Any chunk of 5/16" coolant hose should work...

Maybe 3/8".

Just to close out this thread with my solution . I used Gates #18030 and trimmed to fit.

just don't trim it too short on either leg because it needs to bend around the upper intake manifold runner:icon_tup: