Here's a follow up to my previous post:
600M arrived today and works fine so far. 6020 stand also arrived today and after looking at the stand pipes, it will not be easy to modify. If you have welding skills, it should be no problem, but otherwise you will likely need to order the pipe assembly from Pioneer. Their site lists the assembly for $44.50 but after calling they confirmed that this is only for one side (each side is identical and part number is the same). Bottom line is you will need two and out the door it cost $109 shipped. I place the order since I will be using this stand permanently for the 600m. In the end, it will have cost me $185 for the stand, so still a little better than dropping the nearly $400 for a new one. Of course, if you don't mind the gap under the TV with the 6020 legs, you can get away cheaper, but for me, the TV won't fit in the media center at that height.