They'll fit perfectly fine. I don't think that style of wheel will look very good in 15", but... It's up to you. You may get a little bit of rubbing at full lock on the front swaybar, but nothing consequential. And if your car's lowered, depending on tire size, you may get some minor rubbing up top on the inner fenders when going over big bumps. I doubt you'll run into that problem though.

I wouldn't hesitate to purchase them for a 140, if I wanted them, that is. Go for it! :)

Here's one of Marc's older 145s, with +43mm wheels on it.

"My little hot rod wagon. Here is a list of all the interesting stuff on the car, sway bars, early IPD header, GT instruments, IPD adjustable EFI computer, 164 brakes, Fiberglass hood, altered lower control arms that lowers the car that much more, 7 spoke T5R wheels 7x71/2. The fit on the wheels is very tight but works and I think that look dam cool on there."
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Kyle - 142, 145, and 244! - Oregon Volvo Tuners?