Did you ever get a result on this? I’ve got a RHD Fiat panda cross, 4 seater 50/50 split in the back. Two headrests and buckles and would LOVE to get a third seat for those moments where I’m just driving family up the road.Do you know this to be a fact or are you assuming it can't be done?
I went into the service dept at the main dealer and they said yes it can be done you just need to attach the belt to the belt bolts under the seat, speak to parts, so I went next door to parts and they said no we can't sell you a seatbelt it's nothing to do with us.
So I looked on the internet and I can get a seatbelt and fix it myself. I phoned my insurance and explained the car was registered as a 4 seater what would be the implications if I added another seatbelt to make it a 5 seater and they said none at all as far as they were concerned. I said are you sure, can you double check that for me? And he went away and came back and said absolutely fine by them.
Couldn't get any reply from DVLA by phone or email but on my V5 there is a form you can return with amendments and one of them is change of seats. So I'm thinking fill the form in, send it back and wait to see what their response is, if they send me a new V5 with 5 seats then I do it, if they send it back and say no you're an idiot then I won't do it.
I’ve been toying with the idea and wondering if it was even possible