HELP!!! - exact 737 Overhead width

Hi guys,

As the title suggests I need the exact width of the overhead of the 737NG. I started making a mini one but am thinking of going full scale with a temp overhead just because it's so cool seeing all the annunciators lit up. At I later stage I will purchase one but for now it's got to be homemade.

I have several drawings, .. and they all indicate widths varying between 62cm's and 66cm's. I printed out a large drawing but it looks slightly oversize.

.... and the really stupid thing is I spent 1,5 hours with Marty in his sim yesterday afternoon (so blame me liking the pretty annunciators on him!!) and I forgot to take a tape measure with me.

Could someone measure their panel and tell me the exact width in mm's?

Thanks!