They were actually meant for W107's but W116 450SEL 6.9 owners soon realised the benefits of low profile 15" tyres when driving hard. They are RARE, they are EXPENSIVE . a set of scruffy ones sold on ebay last week for $1200 which was cheap. The classic center in LA has two sets for sale.
They are a great fit on W109 300SEL 6.3's too. Today good 15" performance tyres are getting hard to find now.