I have an 81 Kawasaki KZ550, I noticed a lot of other 81 KZ550's have a rounded gas tank and look completely different than mine. The gas tank on mine looks kinda shaped like a casket with sharp lines. Mine also only has a single front disc brake. I'm having trouble locating the correct parts to rebuild my brakes because it seems every other KZ550 on the planet came with dual discs. Can someone please help me out and tell me what the difference is? Will a dual disc parts work on my single disc bike?