k-jetronic help required

After looking at my fuel mixture ive found the fuel mixture screw missing

A = does anyone have a spare i can have please

B =where s the best place to buy a new mixture metering head from

Thanks in advance 

I don't,  sorry.  However deutche doktors might. They buy and keep loads of mk1 golfs for restoration. They also do lots of engine conversions, so have secondhand parts from the removed engines.

Deutsche Doktors - Contact

mixture screw ?