I thought of it first! I have them on my RA65 and I think they look MUCH better than the vents. And they don't leak like the vents do. Be prepared to splice in some wiring but it's not hard to do well and make it look stock.
I swapped with a guy in the US who wanted vents. Maybee post a question on the Old Celica Club list at www.celicas.org - someone *might* want to do the same.
Toyota Australia in all likelyhood won't have a part number, and even if they did, I wouldn't want to know how much they'd want for them!