V Belts for Westwood 36" sit on tractor?

Just bought a Westwood T1200 with 36" cutter deck sit on tractor. It's in a real mess and all the belts are shot. The only part No's I can get are for Westwood spares at £23 each. Can any one give me the belt types for the twin cutter deck and manual 5 speed gearbox drive such as **A1840 A71** I can get these belts for £9 not £23.
Thanks in advance