Dealer trying to rip me off?!

[psywzrd]

I spoke to my local Hummer dealer about getting the GM mudflaps (part ##17800723) installed on my H3. They told me it requires the removal of all 4 wheels and about 2 1/2 hours of labor (approx. $190 in labor alone). Based on everything I've read here (and using common sense), that seems pretty excessive. I'm not adventurous enough to do it myself (there's no way I'm taking a drill to my Hummer), but people here have done all 4 mud flaps in 15 minutes without removing the wheels.

I had a very bad buying experience at this dealership (didn't buy the car there because they wouldn't accept GMID AND they wanted to charge me $2500 over MSRP) and it doesn't seem like the service department is going to be much better. The problem is, they are literally 2 minutes from my house and the closest Hummer dealer after that is about 45 minutes to an hour away. What do you guys think I should do? I really want to get the work done there because it's so close (I'm also going to get the Hummer chrome gas cap installed), but I'm not paying almost $200 to have $79 mud flaps installed (they quoted me $35 in labor for the gas cap installation). Should I ask to speak with the service manager and try to negotiate the price down or am I wasting my time? I know dealerships can charge whatever they want for this type of work, but this seems ridiculous. Thanks for any help guys.