I need a new clutch for a Husqvarna 61 serial number 1983 028295 which one do i need as there are several different ones?

I have had a look on Husqvarna and there is not a part diagram for that age of the machine. The earliest one on there is 1991. I have checked this and the clutch it ends up to is https://www.lsengineers.co.uk/catalog/product/view/id/122361