Would a 1978 sporster quick bob fender and the factory struts on my 79 lowrider give it enough of the down step like a hard tail has to run a king and queen seat? Im havinf trouble finding a king and king for a swingarm bike that i have but no luck. Im trying to think of the easiest way without hardtailing it. Any help with what im wanting to do direction wise would be awesome thank you

 

I cant say for sure but I doubt it. Those King/Queen seats are made for hardtail frames.

 

Lets say you somehow rig the fender high enough to accommodate the hardtail seat.
The gap between the tire and the fender is going to be " less than attractive"
Dennis Kirk has "mini K & Q seat" for your bike but I suspect it`s not the look you're after

 

On a hardtail, the driver's part of the seat sits down more in front of the back wheel, rather than on top of it.
That's why it looks cooler. You can do a swingarm version of that seat, but the whole thing will just be taller.
My hardtail, when I was young and immortal...

 

king and queen seats are all on ebay.