You're in the same boat I was, I just looked at the different bags available and found some that looked about right to fit, then made my own brackets.

There is a good comparison of other manufacturers bags on the slam specialties website, and or most all the manufacturers list the specs online or in a PDF you can download.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-