Boy this really turned into a layered onion.
Thanks for the info, Works Bell is definitely the way to go from what I've seen (at least for Nardi wheels). It seems 535 is for the SRS/Airbag trucks, which in the US is 95+. However, JDM trucks either must've had SRS as an option in '95, or not at all, I lean towards expecting the latter and it may even go beyond '95.
Here is what I found from Works Bell's website, unfortunately (for me) all in katakana:
The notes indicate that for non-airbag trucks with cruise control, it will be 533, 532, or 522. 533 Annotation 3 says it is for trucks with the cruise control switch on the wheel (???, never seen this), or 532, 522 for the stalk-type, depending on which connector type you have:
Luckily I have a Japanese friend who took a peek, and according to them 532 is for the left connector, 522 is for the right. I'm going to order 522 for mine and give it a shot. Just wanted to share this for others in the future.