Budget underhood AC retrofit.

Are there any A.C. gurus on here that can help me find an expansion valve? I have found all my parts so far in Google searches, but my expansion valve is proving a bit harder. I have bought 3 so far and none have been correct. It needs to be suitable for 1.5 ton with a #6 Male insert o-rng inlet and a #8 Male insert o ring outlet.
What I could find online showed the original piece being 1.5 ton so that's where I got that from.
I'd appreciate any help as time is running out before I should be driving it!
Cley