I want to update my oil cap. Can I use a cool modern one from a aftermarket subbi dealers!

No

Do what I did, well not step by step or that will drive you nuts. I got the rubber seal out and hit the cap in two steps, inside then outside with dry time in between. Use primer to suit chosen paint. I used the brightest yellow oil based enamel spray paint can I could find

 

Several primer coats then several top coats, days if hardening time then glued seal back in with more than original. Result is a bright and happy fill cap so easy to see. It also mimmicks modern idea of anything driver should check under bonnet us yellow

Sexy enough? The new too on the seal added a better sealing also

Ive seen lego oil filler tubes used on the ea82 i think its a direct fit but i cant confirm that

I tried an EJ filler chube from a 1600 impretza as the POM's call em. No work, chucked it

The murphy had a legacy 2.2l oil filler tube on a ea82t it looked like it bolted on but it was on there the first time i worked on it and dident realy pay atention to how it was on there but i know it can be done