http://www.moto-amore.com/heidenau/new/ ... new_b.html
Ural tires, they have a 4.0 that looks sort of trials universalish, anyway, another source for kubbly tires. Also check out the Kenda 671 in 3.25 x 19, a newer dual sport tire, but I think it'll might look pretty good on a CL. Classic Motorcycle magazine ran them on their Triumph "desert sled" project a couple of years ago.
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1965 Honda CP77 — Ulsan Metro City, Rep. Korea
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4.0 x 19 & 3.25 x 19 tires, a new source
http://www.avon-tyres.co.uk/motorcycle/sidecar
Avon sidecar tire in 3.5 x 19; looks like a good rear tire choice
Avon sidecar tire in 3.5 x 19; looks like a good rear tire choice