Hi Peter,
If the distance from grating to sensor is 23.5 mm you should be able to easily fit the useful part of the spectrum (0 to 7000A) horizontally across the camera field (If this is a mono camera without an IR blocking filter the spectrum will continue further into the IR up to perhaps 9000A and there will be a faint overlapping second order spectrum beyond that but the part we need is just 0-7000A.)
Cheers
Robin