Macs use CUPS as their printing processor, which requires PostScript. There are other drivers that you can try, but you can't guarantee that there won't be issues, or that features won't be missing or unable to work.
One question you always need to ask before a sale is what kind of computer the person is thinking of using with the device. If the customer is using a Mac they should be used to overpaying anyway, so the cost of a PS card shouldn't be unreasonable. You should be able to find a card online. There are a couple of good sources for these, if you can't just get it straight from Ricoh still.
I got one for my office machine when I started using Linux laptops for supporting a few customers from here:
Ricoh and Sharp Parts 50 to 80% Off Harvested Parts but it looks like the 171 is currently out of stock.
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