Yes for the 8500.
To be honest either the stitched one or just the 'old' PO rubber strap will be good enough.
Seen the TDs offer straps for the 45mm but can't find many that offer the 42mm.
Only narikaa offer a 20mm strap so far and it could be a 30 day wait to the UK, guess may have to be patient!
Cheers
I am curious which one Narikaa offers? Old style?