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Don't forget a supply of wooden toothpicks. These are essential to remove the last of the goo from the deepest crevice of the pulleys, unless this is done thoroughly the goo remaining will contaminate the new belts.
Somewhere I have the dimensions of the main belt, an o-ring as used in hydraulic systems works well. VCR rubber tyres work well on the pulleys. Do not forget the brakes, the pause stub and the clutch inserts on the spool tables.