rear wheel arch rust

I own a 1994 300tdi disco. Spending a good amount of money on her as we all love it. Poblem is rust has started to penitrate the rear wheel arches near the seat belt mountings. Does any body have any good ideas? I have replaced the boot floor and cross member is there a kit out there for the rear arches? ta

ive just had both sides done i couldnt find nothing like kits just had to fabricate heavy steel on top and bottom and weld solid i got it done for £30 a side not bad i think because when the worst was removed you nearly put your whole hand through it

i've a 1993 disco on me "to sort" list with rust in the same place although it goes right up the seat belt mountings and even the front seat legs are rusty!!! local garage said they did one a while ago that was in a similar state but it were a fookin nightmare....

nip to a scrappy, find a decent one, cut out the arch, weld it in to yours?

thanx for the tip