Are these encoders all the same part#?if so what is it? does any one know where to order this? Only number I can see on the 48a is 903T ALPS. I have found Mouser has the power on/volume controlpart# 688-RK0971114D0B and only 3 bucks or so. Mike Goshay w6we CM95raNipomo,Ca 93444PS I will be on for the 2m sprint!!!