Butler Creek Size Needed -- Nikon BM

[match]

Does anyone know the correct Butler Creek flip up cap sizes for the Nikon BM 6-18 x 40 sf scope ? I can't seem to find a fit chart that shows the 6-18, only the 4-14 scope. Also, I noticed that the sunshade is a smaller diameter than the objective bell (I'll be needing the correct size to fit the sunshade).

 

[rotorhead]

Measure the outside dementions of both ends. I might a a pair i'll sell cheap. The only way to know for sure is measure them.

RH