If you notice, on this page there are two chassis mounting bolt spacings for the short chassis Boogie. The wider one is for original MkI, MkIIA, and early MkIIB. I believe the MkI Reissue bolt spacing is the same as the MkIII and MkIV. Just is case you didn't already know 8) .
http://www.vintageboogie.com/Price1.htm