I have an99 Ultra and picked up this drivers backrest at a flea market. I was told it
fits my bike. Anyone have an idea on it fits?

 

Looks like a back rest for a touring bike it should fit most..don't know if the 99 have the same frame as my 08 but the back rest looks like the one i bought.

 

Looks like it oughta....I have had that same backrest/mount on both a 93 Electra Glide Sport, and an 02 Ultra. On the 93, that front tab wouldn't bolt up to anything, but it stays stable with just the two bolts in the main portion of the mount.