I'm sorry, but you must be kidding.
A $190 markup on a $550 product? This is MORE THEN FAIR!
Do you expect them to sell it for $400 or something?
As a rule of thumb:
I you own your own business, try to make 40-50 points of profit on parts, and 60-75 points on labor.
Ask any profitable brick-and-mortar shop.
The final price is determined by market tendencies and supply/demand, but those wheels are completely acceptable in markup. The intake is probably a bit more close to reality, though.
Dispute? (dunno)