Swivel Seat Fitting

[Purfleet]

Hi all

i am new to this alphard/ camper game, so be gentle with me!

after buying our Alphard the wife and i decided that we would like the front passenger seat to be able to swivel to create a bit more space when relaxing with the dogs.

I found an alphard swivel plate on hte internet and ordered it - al delivered, looks like one i have see in a video so all good.

Cracked out the spanners, popped off the plastic cowling and removed the seat with the 14mm bolts, then fiited the plate. All good except when i come to bolt the seat to the plate the front bracket that bends down at 90 degrees with a large pin in it is in the way. The pin (photo attached) doesnt have a nut or a slot for removeal and i am completly stumpped.

I am sure the front bracket needs removing, the back bracket has simular smaller bolts(?) but i dont think they have to come off, but the fronts......

Any ideas would be gratfully received!