What usd fork will bolt right on to kz650?

I have a 79 KZ650 B & want to put on a different front end. So which USD (inverted)ones will "bolt on" the easiest? I will be using the stock wheel & I am not worried about break mounts as we are ditching the stock break setup for a smaller, thinner disk & maybe a double piston setup. I know some mods may be neccessary but I am trying to find a fork that we can just slip right on with least amount of mods. I also want it to have a top triple tree that will be able to accomadate some risers if needed. I know a lot of those modern usd forks will take clip on bars only - don't want those. What do you guys suggest?