If you are unable to find your system or manufacturer listed below check out the overall length of the belt fitted and you should be able to find the belt you require. Select the nearest length, if you are unable to find the exact length (as belts stretch slightly with use and age) choose the nearest shorter length. All belt sizes given are approximate and may vary. To check drive belt length for most Japanese type full platter decks remove mat and lift platter off centre spindle (remove circlip if fitted), turn platter over and measure the circumference of the drive hub and deduct 5-10mm to determine correct length and tension. Fit the new belt onto the drive hub and replace the platter then hook the belt over the drive pulley through the inspection hole in the platter before replacing the mat. The drive hub circumference can also be calculated by its diameter D using the equation D x 3.142 (Pi).
The process for split platter transcription type decks is similar except in this case the outer section only needs to be lifted off and the measurement then taken around the drive hub and motor. The correct belt length can then be determined by deducting 5% of the measured dimension which generally equates to 20-30mm less than the measured dimension to ensure correct tension for the new belt.