Here's what I know right now. The Deist restraint meets the letter of the rule to a tee. Simply adding a 3 bar to the loose end of a quick adjust type restraint doesn't exactly meet the letter of the rule. I think there's some discussion going on as to whether or not there's a enough grey area fuzz around the wording of the rule to allow an added 3 bar to be acceptable.
The Deist part number is 60019. Google results for that come up with two relevant results - one is the Deist catalog (which is showcasing SA95 helmets) and the other is some performance shop with an old outdated website that may have stocked these 10 years ago. Someone I talked to says you can get the 60019 from Deist right now and then Brian says that Ben from DJ is saying "they" don't make them any more. As best I know it, the 60019 from Deist, if it can be found, is possibly the only restraint that meets the rule as intended right now.
Don't freak out yet... I'm still digging.