I doubt you're going to find a radio and face plate that just fits right in without either looking the added part or worse, requires you to modify the holes due to the spacing and narrow height of the stock opening. If you've decided against stock, another option although probably more expensive, is to get the correct radio head and then have it retrofitted with modern AM-FM electronics. Some even offer the option of iPod or satellite radio. You might possibly not need the power unit that way, and just mount a speaker in the normal places. Here's a couple more options.
http://www.antiqueautomobileradio.com/http://www.bobsradio.com/ This place has an interesting product called secret audio that might work in the space.
http://www.vintagecarradio.com EDIT That's a nice looking radio you picked out but looks a bit high and narrow. Looks like adjustable spacing width on knobs though & some nice features. Does European broadcast use same frequencies as US? Packard measurements appear to be 195mm knob spacing, face opening 143mm wide and 50mm high.
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