i would buy the frpp uppers, but why replace em when i can just replace the bushings for alot cheaper. alot of people dont know this but its the same part on our cars. from MM..
" Although Ford Racing Performance Parts claims their bushings to be "twice as stiff" as stock, our testing has shown that while they are much stiffer than Fox chassis bushings, they are identical to the 1994-04 bushings.
While for 1994-04 cars these control arms offer no improvement in performance, as they do on Fox chassis cars, they are a great value when replacing arms with damaged or aged bushings. Because rubber deteriorates simply from age, after several years the control arms are ready for replacement. High horsepower cars and those used for track events tend to damage bushings before they can degrade from age. These replacement control arms, along with the axle end bushings, are a great way to bring back or upgrade the performance of your Mustang."