They are a good number... just NOT available in the USA. Send Alamo an email... they can get them for you......
i did end up emailing alamo and asking, but in the mean time i went to toymods.org.au and let me tell you those aussies know all..
with a simple and quick search and number of people had asked the same question
seems that toyota kept the same ring design on the bluetop, early redtop (bigport) and 1st gen 4AGZE all had the same size rings on the top and middle rings.. Then Toyota changed the smallport highcomp, in 1990 and this is where i found my answer. After toyota changed in 1990 they havent since so a lot of people use the smallport rings for the later model gze's ... im pretty sure that you could even use the smallport rings on a silver or blacktop without it making a difference too. just an FYI!
sorry for the long explanitory but it is something that people like me might want to know later. Thank you -Marc