Central locking console switch question

I am looking at retro fitting my 560SEL with a console mounted push button to activate the central locking. I already have an aftermarket alarm with remote locking that will have the control module to drive the locking pump so I should be able to supply this module with power from a new switch that I want to install in the same location as the horn and rear blind switches. My question is what model would have a suitable size and look switch that I could use? Anyone know?

Cheers
Matt.