These work for me. So far.
Disclaimers! All of these LEDs are made of 100% pure Chinesium, so let the buyer beware! But they are the only LED bulbs I have found that fill the bill. DO YOUR OWN RESEARCH!
My ‘93 968 Coupe is stock electrically behind the lights with the exception of an LED light bar illuminating the under side of the speedo/tach/gauges.
These LED lights installed easily and work well right now (newly installed), but for how long? Who knows? They are much brighter and provide much better visibility than the original Halogen bulbs. They seem to be well tolerated by oncoming traffic – no high-beam blowback. Finally, they are plug & play in my car – no pulsing or other misbehavior. But they are 100% pure Chinesium, so …………
1. The LED H4/9003 Headlight Bulbs are a little longer sticking out the back of the glass headlamp unit (944 631 912 01) than the original Halogen bulbs. The plug cap (944 612 935 01) did accept the slightly longer LED bulbs and seems to have connected properly and securely. Caveat Emptor! - YMMV.
2. The H3 LED Foglights seem a little less bright than I would like, but, they are foglights, so …
3. N.B. Amazon is showing limited stock available for the H1 LED Bulb as of 2/17/22 – be there or be square! The Driving Light socket requires a replacement LED bulb with very narrow max thickness to fit in the narrow Halogen H1 socket hole. These LEDs do that for me as they have an advertised max thickness of 8.3mm.
Provided FWIW. Good Luck!