197 Upper ball joint circlip

Would anybody know the size of the circlips used for the upper ball joint?

Trying to source one as i wasn't supplied one with my ball joint.

Cheers in advance!

Jordan
 
8200468427 is from the race manual but no size I have one fitted to a new balljoint but I'll have to get the external circlip pliers to remove it to measure. OK I've just measured one the ball joint body is 44mm the slot is 41.5mm so the circlip 42mm (38.5 unsprung) should do it.