Advice on parts needed please- fuel filler welding

Hi all, the car is booked in for rust removal and the repair panel to be welded in- where the fuel filler has rusted.

I have the repair panel, a new filler neck, are there other parts I should be supplying that the bodyshop will need? I've heard that the filler nexks can be difficult to fit too… it's from either Crazy Quiff or VWHeritage, can't remember now!
Obviously we know there might be more surprises waiting, but hopefully the full restoration and repaint in 2008 will lessen the chances.
I'm using Chappell bodyshop near Brand Hatch. Recommended by ETA motorsport who look after my Alpina, and they do the Ferraris from Brands, so they're used to rust and achieving a good finish!
Thanks for any advice.

There's a foam that goes between the neck flange and the inside of the bodu work. This will probably need replacing.

There's also a plastic spacer ring that can sometimes get lost if you don't know it's there.

Ian