I had a set of 36mm '82 Kawi GPZ 550 forks on my 750. Since my fork tubes were 35mm, I had to use the GPZ triples. This caused interference with the fuel tank, with a much reduced turning radius, which is why I am now switching back to K7 forks.
On the plus side: the GPZ forks had much better damping, and less sticktion than the Honda forks, both the K1 and K7 versions. Also, the dual disks were more effective than the single K7 disk.