Hey there!
I know it's been a while, but as it's still the first post you get when you google it:
I'm pretty sure he uses DUNLOP STRAPLOK DUAL DESIGN.
I just received a pair of them and they fit perfectly for the original holder mounted to the Modulus FB4 Funk unlimited. There also is a flush mount system (DUNLOP STRAPLOCK FLUSH MOUNT -

) for it - maybe that's what you're looking for.
No idea on the strap itself.. I got here googling for it
