it can't be used on anything but the AEM system, however it looks about the right size. A local shop around me has a bunch of them, maybe next time i'm there i'll ask the owner if I can just trying and mount one for shits and giggles and let everyone know the results of sizing. However I do have a twin turbo, so it won't be used on my Z. But perhaps for NA's, i'll just check the sizing.
1990 Nissan 300zx Twin Turbo Stage 1 1990 Mazda B2200 SE-5 Pick Up My Z