More thank likely the operators manual and service manuals for this vintage truck are only available in paper form.
Suggestions:
1. Communicate with the parts department - sales types & service types and others tyoes too want you to buy what they are directly selling - equipment & service maintenance & repairs. Parts people want to sell parts and most orders for manual goes through the parts department.
2. If that doesn't work with this dealer try another dealer go to the Clark website for dealer locator clarkmhc dot com - replace the "dot" with a "." & eliminate any open (white) spaces.
3. No matter who you order it from you will more than like pay for shipping & handling in addition to the manual price, it may be to your advantage to not request quick delivery like overnite. Let your order come in on their next stock order placement with their parts depot. You will also pay for shipment cost to you from the ordering dealer unless you want to personally pick it up - you will need to drive 160 miles round trip or burn about $35 to $50 of fuel if you vehicle gets 20 mpg.
GL