Wilson when you say chassis comfort kit do you mean the NVH mounting for the bevel box? If you do you should not be charged for it as the replacement chassis comes with that whether you want it or not. Its been standard fit on new builds for well over a year now & replacement chassis are to the current spec.If you are talking of the steering comfort kit that would be chargeable.
I bought a Harley rectifier on ebay from US 2 years ago & seem. to think it was around £80 delivered.
Tim