Hi Nick, it's a Zenith 32 IF 7, same as I have. I think the idea of the heating pipes is to make the carb run more efficiently, especially in cold conditions, but I'm sure some kind soul on here will correct me if I'm wrong. I found the plastic tee-pieces on eBay, and if I can find the invoice with the details of the company I'll get back to you, but from memory they are 20mm x 20mm x 16mm. The breather pipe from carb to rocker-cover is correct, although it should be straight, but the small spigot where you have no pipe attached should have the pipe from under the carb connected to it, with a 1 1/2 mm restrictor in it. This is all to do with emissions, and the car will run better with this. The restrictor is available from 4 R-quatre.nl, an excellent Dutch supplier of R4 spares. Hope this all helps, regards Brian.