yeah, my bad, I kind of sped past that one. we are working on a document that will be posted on our website to better explain the difference.
Our digital housing legacy can be traced as far back back as the Nikon D100 and D70 as well as the original Canon 300D /Digital Rebel, that's a lot of housings and a lot of possible combinations, and it needed to be addressed.
the one you would need is the Type B with the LED attached on a wire, or better yet, a 19227-A7D which tell us what housing it is going to be used, so the wires length are trimmed perfectly for your model of housing, FYI, that is valid for all models of Aquatica housings,
The generic model has somewhat longer wire leads so it can accommodate a variety of housings (including third parties).