1981 Mondial8

There are lots of threads on this site abotu wheels. I have an old set of metrics if you are interested in originals. Otherwise you could increase size, I currently run on a set of 348 rims. But you need the bolts as well, which can start to get expensive. Superformance also do a nice aftermarket set

 

Charles, where on the planet are you?

As Andrew's already said plenty of options from Ebay to buying aftermarket and pretty much all of them are cheaper than buying a new set of milli's..

 

I've got the same car and in the end I bought imperial wheels from www.superformance.co.uk and they are fantastic. The choice of tyres is almost limitless now whereas before I could only get hold of Mitchelin's at ~ £300 ea ($510 ea).

There are a few guys on here who have bought them from Uk and had shipped to USA. Here's a few images.
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Charles,
Definitely fill out your profile... You'll find TONS upon tons of useful information here, but having your profile filled out (specifically, your location) will really help people narrow down their answers for your questions. Your question about Mondi wheels is, from what I know, a fairly common one. I'm sure you will have no shortage of options...

Best regards,
Aaron