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You will need to change the shim thickness .
King Pin Bearing Preload ADJUSTMENT PROCEEDURE
Reading The correct reading should be 30-60 N·m (22-44 lb ft). If the reading is outside of these limits, change the shim thickness.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the king pin nut (2) to 550 N·m (406 lb ft).
I find it hard to believe that a shim costs 45.00,but I have worked for a dealer long enough to know that there is no limit to their 'mark up" if they think they can get it.
i suggest you try some of the truck shops or even Ford or Dodge,for shims .All that matters is the thickness of the shim & the hole size of the king pin.Try these places also.