Help! 1969 Nova Multi-Leaf Spring Perch Width?

Hi folks. I'm having Strange Engineering build me an old school Dana 60 housing for my '69 Nova. They just sent me a message asking which of the two spring perch widths I want for the housing -- 2-9/16-inch or 2-3/4-inch. I contacted Eaton Detroit Spring and the tech guy there never heard of it. He claims the stock multi-leaf spring is 2-1/2-inches wide, which leads me (and Strange) to believe the perch should be 2-9/16-inches wide.

Help! [img]<<GRAEMLIN_URL>>/confused.gif[/img]

Wayne