Depth of rear deck and distance between speaker opening?

[shufflnmadness]

Can anyone tell me the depth of the rear deck and distance between the rear speaker openings, I am considering buying a Boston GT-50 5 channel amp to mount under the rear deck (they can be mounted upside down). it is 21-5/8" wide and 8-7/8" deep. Anyone heard or own one of the Boston amps I haven't had the chance to listen to one (if you can go by their speakers they should sound great).