Carrying on with prepping the boot floor, I noticed these plates on either side on my original floor. No idea why they are there, maybe something to do with strengthening the seatbelt mount which is above it?
Anyway I decided to put them back, so made some new ones using the old seat base
zinc primed
Welded on:
Penetration was ok, not bad for my first bit of 'rea' welding on a panel
then zinc primed again