Dear Spook,
It seems I'm in a bit of a pickle here as to which LED to recommend for US cars. According to blue Volvo pocketbook you should be using type 9004 HB1 bulbs whereas my headlights are E-code (european) type using H4 bulbs. I ordered mine from UK which has quite a choice for H4 bulbs made by Philips/Osram. At least you should go for 9004 bulbs using Lumileds LED as they made by Philips.
Here's an example, however it uses a driver box which could be placed beside the headlamp enclosure:
https://www.ebay.co.uk/itm/Tunez-9004-HB1-LED-Lumileds-Car-Headlight-Conversion-Bulb-Head-Lights-Lamp-White/183235488024?epid=704121486&hash=item2aa9afa918:g:JD0AAOSwnTpbAnpE
Amarin.
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