If you lost one of the warning lights could that be the right size for the switch?
Otherwise symtec make a very neat round 3 way rocker switch. On my 90/6 it has been squeezed in between the main binnacle and the LH instrument pod (the same that you have). It's fairly neat but a bit ark ward to use with heavy gloves.
The Symtec heated grip pads seem to work very well and put out a good amount of heat. Easy enough to fit and reliable to date.
That's a very neat tacho, is that a BMW part?