What flip up covers fit these scopes?

[breakingcontact]

For the life of me I can't figure out which Butler Creek covers fit these scopes, I've looked at the specs on the Nikon website, Butler Creek and in my manuals.

Looking for covers for:

Nikon Prostaff 4X rimfire
Nikon P-223 3X

I suppose I could trace the outline and do some math or measure it with a string.

Suggestions?

 

[burrhead]

Uhmmm a tape measure across the widest distance?

 

[breakingcontact]

That would seem the obvious answer, but some of the covers are just 1 mm different in size. Would prefer to hear what worked for someone else than having to buy and return covers.