Yes, I installed cruse control on my bx23. Piece of cake.
I don't know anything about a "seat belt slot"...if you don't have an open slot for the cruise control, I'd be confused. I'm guessing you have an 'earlier' BX23...as far as I know my BX2230 came standard with the cruise control, so I would have assumed yours to be the same way.Would it be better to use the seat belt slot and try the 2230 cruise control?