if you go lower than 2 inches then yeah you pretty much need shortened ones or ride quality will get dodgy.but if your only going say 1 and 1/2 inches but planning on getting new shocks anyway then you should get shortened ones.pretty much when you lowered its advisable to get lowered shocks,just if you want a cheaper option its possible to not change shocks if you arnt going past 2 inch,will ride ok,just your stock shocks would wear out faster.
yeah im pretty sure both are at repco,if not find monroe on the web or phonebook,find a stockist and you will get what your after