Hi JohnSL,
Thanks for reaching out. I've sent Carputech an inquiry. My main concern was not to have to 'butcher' anything in order to fit a new unit. Once I hear back from them I'll be sure to let you. and anyone else who may be considering the same issue. I should mention that my mechanic who is also an auto electrician, seems to think it would be necessary to cut the dash itself to facilitate fitment of the original Denso unit.
Kind regards,
Ross