Disclaimer:
Per ANSI B56-1-2005 section 7.37.3, the floor dimensions of the platform attachment can not exceed 2X the load center distance listed on the truck data plate nor have a width greater than the overall width of the truck (measured across the load bearing wheels) plus 250mm on either side. The backs on all work platforms backs have 1/2"-13 FEM to meet CAOSHA standards for the industrial trucks.
As long as the customers truck meets these requirements, they should meet the requirements set forth by OSHA to have a new data plate created for their fork truck. Vestil makes no guarantees as to the fork truck manufacturer generating a new date plate as required by OSHA.