R100 cylinder head

[chipysbmw]

Hi all just a quick question. Does anybody know the 'm' size of the cylinder head retaining nut, the one on the underside of the barrel that is sunk into the fin, on a 78 r100?

I've lost it you see, oh dear...

Thanks in advance

 

[nick.ct]

Any bits here fit the bill

http://www.realoem.com/bmw/showparts.do?model=0377&mospid=51646&btnr=11_1750&hg=11&fg=12

 

[chipysbmw]

hi nick.ct. thanks for your help