I actually got these with the car... so I am not sure what the weight difference is... however I do know the quote you got is about right these are not cheap rims...they are the 20in rims wrapped in Michelin Primacy MXV4 Tires
Hi just bought my first Taurus its a 2010 SHO I have had several modded cars over the years but this is my first ford and so far I absolutely love this car...cant wait to Livernois and get it tuned...