Yes, like that one. Actually, the seller in that auction is Dr. Jonez. He's a very active member in the MKIII community and is largely to thank for the MAFT Pro supporting our car (he worked directly with the people who make it), and is an official vendor.
From what I recall, the Lexus AFM housing isn't 3.5" (90mm) and has a lot more restriction than even a 3" GM MAF. GM MAF's are inexpensive, less restrictive and a lot more durable than the MKIII Turbo's Karmen Vortex AFM.
(Didn't I cover all of this in that thread I gave you the link to?)
If you want to be able to use the Boost Control feature you need to go with a speed/density setup. This system uses a manifold pressure sensor and a temperature sensor to calculate the amount of air entering the engine. The pressure sensor is required by the boost control software.
You can use the MAFT Pro with stock MKIII Turbo electronics (using the Lexus AFM in the MKIII still requires you to swap in the stock sensors from your original AFM). In this setup it acts like a fuel controller and timing controller... but I don't think it supports boost control. I may be wrong, but I'm pretty sure that at least for now boost control ONLY works with a speed density setup. Besides, switching to either a huge MAF or going to a speed/density setup is a big step up.
If you're comfortable with the Lex AFM mod and doen't want to have to play around with all the settings to get the car running like a champ then stick with the SAFC II.
As with any piggyback, it is STRONGLY advised that you get a wideband 02 controller and sensor to track your air to fuel mixture... one of the easiest ways to kill a perfectly good engine is by tuning blindly.
If you do want to look into the MAFT Pro further shoot me a PM and I can help you track down wiring diagrams and writeups.
By the way, I have a N/A MKIII (actually, the only N/A MKIII running the MAFT Pro... for now). It's a rather different setup than the setup on Turbo MKIII's. I am currently running a 3.5" GM MAF, but I intend on switching to speed/density both so I can do another writeup for the N/A owners out there and to get ready for when I have the time to bolt on my turbo.
EDIT: Oh, as for additional items needed: It depends on the setup you decide is right for you. If you decide to speed density you'll need a MAP sensor (pressure) and an IAT sensor (temp.) and a wire harness (which you could make yourself if you feel up to it. If you want to go MAF then you just need a GM MAF and a wire harness. For the boost control again a harness and a specific vacuum solenoid. If you just want to use the fuel tuning with your existing setup then all you need is the MAFT Pro and the included wiring.