Re-reviving this thread, I picked up the block and 21.5 mm hose thanks to this thread.
Since I didn't pick it up until a week ago, now the new Systainer3s are out, and we know that they're sized differently.
Not knowing how much spare room was in the SYS-II TLoc, I took a risk and ordered a Sys3 M 137 to see if things would fit.
To my pleasure, they fit like a glove in a Sys3 M - 137.
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If you need more room, the 187 is the next size up, and slightly larger than the old SYS-II TLoc. It should be more than enough room for the block, hose, and I don't know what else.
Also, I didn't think the non-AS hose would be that big of a deal until I walked over and bumped into the washing machine after sanding. Yikes! Still worth it for the ease of use of the setup.