I called T&D and Jesel about a set of pair shaft 1.7 rockers in steel or ductile iron for either a set of 440-1 or B1 and was told at that time by the Jesel rep that they didn't make any steel rockers at all and T&D quoted right at $1900.00 to 2000.00 and 6 to 8 weeks lead time several years ago.
I've since heard that Jesel is now making steel rocker so I'll have to call around again before starting that all out project