The parts that I ordered are starting to come in and I can confirm a positive match for the two plastic housings.
Horns - 4D0971992
LP640 Tail lights - 1J0-973-835
The blade connectors that go inside these housings are larger than connectors I ordered so I'm forced to buy the VW connectors at $.60 each. PN# N-906-844-05
The grommets I bought appear to work fine and as soon as I get the wire and connector stuff worked out, I'll assemble mine and document the process here.
I don't know how I missed it but there is one more connector on the tail lights besides the 10 pin connector that we figured out previously. The female socket part number appears to be 1J0-973-702 (I'm posting a picture of it). These are also around $8.50 each and they use the smaller sized blade connector inside the socket.
Does anyone know what this connector is for? Mine is tied off to the harness therefore I'm wondering if this is an optional connector for rear fog lights or something. If this is the case, I'll either wire mine with my brake lights or with a strobe that I plan on running for the head lights (Pace car style).
Thanks,
Chris