1984 KZ550

I recently purchased a friends 1984 KZ550.
I want to start a Bobber build with it, but before i start i obviously want to spec everything out accordingly.

Any suggestions on a longer swing arm i can use to stretch the rear of the bike?
I was thinking/hoping that most of the parts I use I could maybe get off of a Vulcan.

i want to extend the swingarm, and lower it first and go from there. Ill definitely be adding ape hangers and going to a solo seat, maybe even grab the gas tank off of a Vulcan with the gauge incorporated in it. The gauges on the KZ550 are too ugly.

Thanks in advance for any advice! I am all ears for suggestions.
If anyone has any suggestions or tips about their Bobber build, Id appreciate any input!