Thank you for your reply will do some for searching best wishesNot sure if the latch itself is availabale seperately for your model, did you look online with one the various vin decoders to highlight the part such as MB teile Katalog
Failing that take a trip to a dealers and ask to get a price for the relevant part, or search on ebay for similar cars being broken, be aware some car breakers can charge silly money, so know what you need first and the cost to avoid being overcharged.
The swith on the gbox door on w220 started to peel a few years ago so I replaced it, I dont recall if that included the latch, but as mentioned consider the above.
Good luck and keep us informed!