18RG extractors

ive been searching for a set of chome/stainless/shiny extractors for my 18r. ive looked around and have only found plain steel.
there are some nice ones for 20 and 22r..anyone know if the exhaust ports and studs are the same from 18R to the 20 and 22R?

I dont think so the easiest thing to do id to get the 2 exhaust manifold gaskest and see if they line up, You proably wont find 2 much RG help on here, I dont think 2 many people on here know what the 18rg is but I havent seen one state side in a truck Which I have been thinkg of doing but am building a 2tg for my Corolla You may try on some Celica boards