URO:
Your website shows 20 of these in stock but no way to add to cart. I need one. Timing on production?

It appears there is someone making a replacement per Diesel911's comments. Thoughts on this one?
https://lermscustoms.com/products/w123-brake-booster-line-replacement-or-repair?variant=40430502805654

I'm also finding a supplier for just the check valve with the 2 nipples:
https://ppembzparts.com/i-30510935-mercedes-brake-booster-line-check-valve-double-vacuum.html
Thinking I might use Diesel911's suggestion to repair mine, "Another way would be to cut the plastic hose/tubing as close as possible to the stock Check Valve Assembly and use rubber sleeves to attach the new check valve and nipples. That leaves most of the plastic line/hose intact."