Yeah these AHM 6mm one groove valves are nice. And EXPENSIVE ! 320 GBP for 16 guides is a joke
I've digged in more.
BMW e36 engines have hydraulic 33mm buckets (same diameter as in TS), possibly same dimensions but I've got to find one to check. References are FOL120 or HL6330, while TS use FOL106 or HL6335 buckets.
In M3 version BMW used top shim based buckets and I'm quite sure they would work in TS. But I don't like on-top shims, they are heavy, they sometimes escape from the bucket and you can not adjust them with sand paper so you have to have a kit which costs alot.
Lancia TS versions also had on-top shims but I don't know whether they were 33 or 35mm buckets. I'm quite sure Fiat 1.8 16v has 35 hydraulic buckets.