i want to add power locks and keyless entry to my no power 98 f150

ive found many kits with the lock actuator for cheap around 5-20 dollars online.

im looking for some suggestions. i found a website called www.ford-power-locks.com and they have a kit that has power locks for both doors, keyless entry, and alarm for the doors for 67 shipped. they have a guaruntee that "I guarentetee the kits to work with your vehicle, or your money back!" it all comes prewired and ready to install with or without their switches.

ive been emailing them with questions about the system and they've been responding and seem legit but didnt know if anyone has dealt with them before good or bad.

i want to add the factor switches but dont know where they were located stock and how they would have to be wired (through factory connector?)

should i go aftermarket or search the junk yards for the factory set-up with full harness and about what id expect to pay for this.

any pics of factory or aftermarket would be great.

thanks