im looking for a rear fender to replace the stock one on my 2017 street bob is there anyway i can use the rear fender from an 07 street bob or any fender you guys know will fit my street bob that looks as close to the fenders in the pictures

 

Look at a fender for a late model Switchback. That's probably the closest you'll get to the look in the pics without going for a custom option.

 

Or, get a lowrider fender. See my sig pic

 

Agreed, a Low Rider fender will work. It's what I did. But if he's specifically after the softail rear fender look depicted in the photos he posted, a Low Rider fender won't give him the look he's after. That's why I suggested a Switchback fender. See photos posted below:

 

thank you guys for the help one last thing tho do you guys know if either the lowrider fender or the switchback fender will be able to bolt right on like my stock fender or will i need to do a modifying

 

Here are some fenders that will bolt right up, that are full length. You will however have to come up with a solution to your lights.
06-08 Street Bob
06+ Low Rider
06+ Super Glide
Don't know about switchback. But, search on Google and add hdforums at the end of your search. There's plenty of information on this site covering this topic.
Here is my 15 Street Bob with an earlier Dyna rear fender.