What are the barts i my Sei??

[bubinga5]

This may sound stupid but is it a possibility i have 4 string Bartolinis in my 5 string Sei....as the string spacing is a lot tighter than most?

or am i imagining....im not at home so cant measure

[Vibrating G String]

If you're willing to pull one out the numbers on the back will tell you for sure. All Barts have blades instead of poles so a 4 version will work fine if it's wide enough with the exception of a split coil humbucker which on a 4 version would have the split right under the A string.