early classic drop Spindles

[Chevy Fleetside]

Has anyone used these. I was thinking of just getting these since I have all of the GM brakes. They said they take all the stock parts.
Here is the description :

Drop Spindles achieve their lowered stance by relocating the spindle pin higher in the casting, which in turn lowers the vehicle by an equal amount. The stock spring and shock absorber travel remain untouched, leaving the factory suspension geometry intact. Gone are the harsh ride and alignment problems common with other forms of lowering.
Early Classic Drop Spindles are the original '60-'72 Drop Spindles, and are machined to accept your original tie rods and ball joints (Disc Brakes required). While others offer later model parts that require changing your suspension components in order for them to fit, every Early Classic Spindle is designed for your specific year and model of truck.
Early Classic Drop Spindles are engineered to lower your Truck 2½", allowing the maximum amount of front wheel backspacing on the market.