So, it appears there's a growing amount of folks getting bent over by sellers when buying kombi second row belts. The issue is they actually getting supplied with shuttle second row belts - which don't work well for a kombi conversion.
If you want to keep the shuttle belts (supposedly longer than a kombi belt - though I havent measured either) and remove the shuttle top mount to fit a kombi type mount, here's how you can do it.
Initial layout:
First, remove the mounting bolt:
Secondly, unclip the central plastic insert by pushing the top edge backwards, out and down to the horizontal. Then wiggle the plastic insert out the back.
(Optional step) Thirdly, turn the mount over and unclip the edges of the outer plastic trim and remove it.
Leaves it like this:
Next is to start unthreading the buckle, buckle position clip and lower mount through the top mount you are removing. Like so:
There you go, now it's ready for your replacement top mount.
Fitting your replacement top mount is pretty much the reverse of the above removal process. Just be mindful to load it onto the belt in the correct orientation and not to damage the webbing during the process!
Lastly, you do this at your own risk, it is a safety system you are fiddling with after all and I don't know how ham like your fists are!