What wheels did you end up going with?
Virgos are a common upgrade if you want a period correct & factory 15 inch wheel. They are sought after in good condition. They are known for bending so give them a good look over if you are keen on a set.
Draco's are another 15 inch option, they tend to go a bit cheaper than Virgos. I have a set on my 240.
I saw you mentioned 16 inch wheels. OEM choices are Hydras, and Gemini's the latter are rare and very sought after. They get pricey if they are in good condition , have good tyres and come with the centre cap tool.
There's a decent number of aftermarket options too, but be mindful of fitment issues.