Overland Warehouse was excellent for service, and the owners really knew how to cater to their clientele's needs. Their suspension kit was manufactured by Radflo per their design specs. Of course Radflo who is still in business.
I don't believe there were any patent involved, it was just a matter of customizing parts Radflo already used or had the availability for. Consequently you'd would think Radflo would at least consider making up a suspension set per the original specs used by OV.
Good luck, and here's a link for contact info:
Radflo Suspension Technology - OE Replacement Shock Absorber Applications