What size wheel spacers?

Hey everyone, I got my truck all sat up now, and now looking for wheel spacers. I'm pretty sure I'll get spidertrax, but I don't know what size to get. I'm thinking of the 1.5. Id like my tires to stick out to the flares or maybe even a tad wider than them. Here his a pic of my truck so you can have an idea. Thanks! Please post pictures of yours if available

 

I went with 1.25" spidertrax, on 265/75r16's, they stick out just a hair past the fenders. Don't have a good pic at the moment showing them from the front, only have this one in my phone that shows it post-spacer install.
*edit, just realized this probably helps even less being a 3rd gen.