I know this thread is a zombie, but wanted to update in case anyone is ever looking for a 3950 crystal. Crystal is a CMY336 Omega 27.4mm x 24.2mm according to the Jules Borel database, they are readily available on eBay. I think the CMY crystals are replacements and not Omega OEM, but it's better than the cracked/crazed mess on my new pickup.
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