Relocate cockpit traveller to the coachroof

Dear Hanse collegues,
I like to change back the head sail cockpit traveller to the coachroof.
(Previous owner once swapped it from coachroof to cockpit).
I removed the cockpit traveller with all parts, don't know if all bolts are still original. We still have the original coachroof track.
Need to re-drill / re-tap old mounting holes.

Who can tell me how the coachroof traveller is mounted?
What are location to re-drill/re-tap? What size, length of bolts required?

THanks,
Jorn