ICSConsulting -

You are correct that the previous training would not be sufficient for such forklifts. OSHA 1910.178, Powered Industrial Trucks, 1910.178(l) - Operator training requires specialized training in the forklift to be used and in the environment in which it will be used including the following:

1910.178(l)(3)(i) - Truck-related topics:

1910.178(l)(3)(i)(A)
Operating instructions, warnings, and precautions for the types of truck the operator will be authorized to operate;

1910.178(l)(3)(i)(M)
Any other operating instructions, warnings, or precautions listed in the operator's manual for the types of vehicle that the employee is being trained to operate.

Your best bet is to contact the forklift manufacturer to see what training material they may have available. At a minimum, obtain the operation and safety manuals from the manufacturer. I doubt if any canned programs exist which could meet the OSHA training requirements.