Krupp Protze towing arrangement

Can anyone give me a link or have any pictures of the towing arrangement on the Krupp Protze?

I have the new Tamiya kit with the 3.7mm AT gun and the towing arrangement in the kit is the same as the old Protze kit - just a hunk of plastic like a hook. Is this really what it was?

Surely there would be something to prevent the towed load from just “poping” off!

Any help is appreciated!

Peter
Australia