Try calling Greg at Tri City Competition in SO CA for a good set of H.D. leaf springs up scope
His shop is near Carlsbad, CA, not in Carlsbad. Sorry for not having a phone number for his shop blush
His Son has his old shop in Michigan, it is on the internet under Tri City Competition, maybe he can help you also scope

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)