The David Silver link is great..be careful that you know where you're ordering from..that UK on the end of the URL is the tipoff...my painter said I had to get new sidepanels for my '76CB750, and I ended up ordering them online from CMS..they have everything...price 55.00 each..I was a newbie then and desparate for parts and 55.00 didn't seem horrible to me...then the charge hit the card! It was 55 EUROS! PLUS SHIPPING FROM THE NETHERLANDS! $180.00 U.S! (they now have a unit in North America)...to add insult to injury, a month later, I got my JC whitney catalogue...$29.95 each US! Shipping from Chicago to Michigan..but I got 'em, and they sure are purty, all painted up!
By the way, the painter said that the reason that they get fragile is that the solvent from the paint keeps eating at them over the years until they fall apart..he said he couldn't even sand mine without cracking.