I would not even try it. With that much rubber I would not try to fit chains on. IMHO
I was thinking about chains on my W126 as I have brand new all seasons and it might be reassuring to have the option. Feel free to email me if you want to sell them.
Ops Just noticed you are in the UK do not think it would be worth shipping!
1991 Mazda Miata 174000
1991 Subaru 189,000 Winter beater
got rid of:
1984 VW Vanagon 195,000
1976 350SE Euro 185,000 KM
1973 280SE 4.5 (boy do I regret that)
1980 280SE European W126 4 speed manual (miss it)
1989 BMW 735iL 119000 (good riddance)