Just took these original belts out and measured in their current condition. These are all approx. and with used belts. Micrometer is set to not 'stretch' the belt. While these belts were still installed, the capstan belt still had nice tension, the take-up belt also had nice tension, the counter belt was very stretched and was so big it wasn't able to hold itself in position.
Capstan Belt: 10.07" (flat cut, 0.191" wide, 0.0205" thick) width is 'medium'.
Take-up Belt: 5" (square cut, 0.046" thick)
Counter Belt: 7.18" (square cut, 0.0395" thick)
Here is what I am going to order from turntableneedles.com:
Capstan: FBM9.3 (flat belt, medium)
Take-up: SBS4.6 (square belt, small) *out of stock. Going to order SBS4.6 from ebay.
Counter: SBO5.2 (square belt, orbicular) *out of stock. Going to substitute for SCY5.2 from ebay.