Here is where I bought mine
http://www.americanautomotiveequipme...5318/index.htm
I am not sure what or how you plan on using it but I got all the extras
drip pans so the car on top don't drip on the bottom car

and with the jack tray you are able to raise the car on the lift and pull the wheels to do brake jobs ect.

I like the part I can stand under my car now to change oil (I am 6foot tall) as you can see in this picture I modded my rafters to gain another 8 inches of clearance (my total clearance with mod to rafters is now 10ft 1in)

I also got the aluminum ramps and rollers/casters
I am suppose to be able to move my lift around (but I have not needed to yet so not sure just how they work?)