Hello Ossie
I've got steel (chromed) 15" wheels. I think the spare is original and the 4 running wheels are probably replacments as they are just a tiny bit different to the spare, but very, very similar. I presume from new all the wheels would be the same but I don't know. They are 6 stud and have large centres for the selectable hubs. The rears might have had a plastic cap.
As part of my 30y refresh I've given them all a really good clean ahead of two new tyres and some rust treatment and painting to their inner surfaces and this will do for me. They hold air well (often alloys leak) but are quite heavy. Each wheel and tyre is ~25kg; AT tyres.
During the cleaning I was hoping I'd find some numbers showing the PCD, offset and other dimensions, but no joy. If you intend to get new wheels I'd start with the required numbers and look online. This link might have what you need for OEM: https://toyota.epc-data.com/regius_ace/lh119v/114894/chassis/4103/
If you're thinking you might also need new tyres but the wheels are not knackered have you thought of getting them refurbished? Shotblasting and powdercoating is probably less expensive than new and often available locally.
Cheers.