@
Silvergrowler
,
It looks like the mechanism that you are looking for is composed of a couple of different parts. Village Toyota Parts has what you are looking for and here is the link (their prices are pretty damned good for OEM parts):
2006 TOYOTA 4Runner SR-5 4000CC 24-VALVE DOHC EFI, AUTOMATIC 5-SPEED SEAT & SEAT TRACK
I'm not sure if the numbers listed on the schematic are the actual Toyota part #'s (sometimes online retailers change the numbers to their own internal numbers so that customers do not have the actual OEM part# to shop elsewhere), but I have dealt with Village Toyota Parts several times and they are way cheaper than your local Toyota dealerships! Anyway, good luck!