Have done some enquiries regarding the fuel rail.
Firstly, nobody in Australia stocks the Nissan Avenir fuel rail. From this advice I had to email a Japanese parts place who were very knowledgeable and gave me some good information. If you need parts from Japan I could recommend these guys.
http://www2.plala.or.jp/office-y/nissan.htmApparently the fuel rail for the Avenir SR20DET is also used in B14, M11/12, N15, N30, P10, R11, U13. I'm not sure if it differs between sr20de and sr20det for the U13. I'll find out at the wreckers on Sunday!
Another thing I found is that the front disc rotors of a W10 Avenir is also the same for a R33 Skyline RB25DET.
Hopefully will get the fuel rail sorted out soon!