Yes, the bars are 1" diameter.

If you just change bars to get them closer to you....the problem is the angle change your wrists will have to make if you keep the bars narrow like you have.  If you use the existing mounts and risers it will be hard to get a bar that moves you back any - uness they have more bend and are wider.

You may be able to get a riser that has more of a bend and allows the existing bars to move back.

A set of dog bone risers and a cross tube may be the solution.

Oops. Forgot picture. They give infinite adjustability. Just get a short set and lean them back towards you.

Just look online, they are pretty common these days.

Start here...http://www.lowbrowcustoms.com/search-list/?q=risers

Don't see something you like, check the manufacturers that advertise in The Horse magazine.

Be ready for sticker shock, you're looking at $120USD and up for new in most cases.

Another option, call the parts counter at Bent Bike in Auburn WA, they'll probably just tell you to come look, ask for Tony, tell him they used to be in the battery aisle region. Been a few years since I worked there...  

Address: 4337 Auburn Way N, Auburn, WA 98002
Phone: (253) 854-5605

http://roxspeedfx.com/category/street-pivoting-risers.htm

I bought a set of these, the 2" and I LOVE THEM.  They let you adjust the risers and then adjust the handle bars. By only going 2", there is no need to worry about needing longer cables. I have them set at about 60 degrees... so more up than back.. but they still come back some. You could rake them back more and up less to suit you.