proskunetes,
I could be wrong, but I believe the HONIL adapter IS the actual part number for a 6 disc Alpine. For a 10 disc kenwood changer, it is a KENHON. Get a HONIL and you will be OK with an Alpine changer. I have the Kenwood, and like the extra 4 discs.............
You may be asking about what adapter plug is needed to make the HONIL adapter fit the stock radio. If so, the connector name is a "Molex adapter". It is a multi-pin rectangular connector vice the round "DIN type". Get a Molex adapter plug and the HONIL and your set---know this as case for base radio from my install
If you have not purchased yet, I used
www.autotoys.com with good luck. I got the Kenwood changer, Molex adapter, and the needed adapter (KENHON in my case) for $238 delivered. Was pure plug and play. They also had the Alpine 6 disc for slightly less.
Tim at HondaAcuraWorld also has very good discounted prices on the Acura unit as a consideration. He mentioned he had quite a few in stock, and might make a good deal---it is the same as the Alpine as far as operations. Good luck