sony SPP-A967 Cordless handset need switch

Looking for help getting a part number for a
switch in a handset for this phone.

It's a model Sony SPP-A967

The board desg for the switch is SW601

This is the little thumb wheel switch that when pushed
calls up the callerid or programmed numbers and when turned scrolls through
the numbers one by one.

Any help with the part number and a place that will sell the part to a
amateur tech would be greatly appreicated.

Thanks
Mark