After a brief search, I found an ad in the Sep/Oct 1983 issue of American Handgunner (classic issues are free to view on their website) that lists .357 N frame Comp I speedloaders as model no. J-N1 and Comp I D frame loaders as model no. J-D9. I found a couple ads in later issues, but there are no specific model numbers. Now I am starting to question the existence of N frame comp IIs.
I would imagine Safariland D frame loaders (which would be perfect for the 856) are hard to come by now. I think it might take the often requested, aforementioned 6 shot .38/.357 SP101 becoming a reality to make them see the dollar signs here. Safariland is certainly very hesitant to introduce, or reintroduce, new speedloaders. This is a shame, as it is hard to go back to a twist style once you become accustomed to them.