my German was bad.
It was merely an offer of (limited) help. Seems like you're on the right track now, though.
I, too, couldn't find any mention of part number 61336.
The interface pdf lists only one Volvo cable for the 61303 (table on page 13) and otherwise mentions car-specific connections at the back (Volvo being on the last page).
I'm absolutely certain that has not escaped your attention, Bitt.
I'm stumped- hence my offer of 'limited' help. I have no expertise in this area.
Perhaps Peter will shine more light on the problem.
If it were me, the next thing I'd do would be to attempt contact with a company representative and walk through the specifics of my application and desires.