The front springs I have been running are ID 65mm and 250mm long. The springs become a bit free when on the hoist. I am now thinking of using helper springs (or whatever you call them). Kings only list 2 helper springs in 65mm. Soft and hard. I guess I would get the soft ones plus suitable spacers.
Depending on your tyre, the bottom locknut can get very close to the tyre. For this reason I suspect some people run 200mm springs.
What springs are people running?