61 F-100 Leaf Spring Perches

Hey guys,
Work's a little slow today so I figured I would order some parts that I need for my 61 F-100 Unibody. I'm doing a rear axle flip to lower it and need to order some new leaf spring perches. I know I can get them at Summit, but I can't remember what size I need. It has stock springs and axle. Could someone possibly throw up a link or give me the demensions of the correct ones to order? I would greatly appreciate it. Thanks!

 

Got mine for my unibody at speedway 3 inch axle tube.

 

Thanks...Thats what I thought!