Tensioner Part Number. Assembly or pulley?

I'm going to be replacing my tensioner pulley, and went onto Toyotapartsales.com (my local dealership is too far away to drive to. I would rather order online). There's a few things that can be purchased as part of the tensioning system.

Here's a list of the part's (obviously the 2.7L doesn't apply).

tensioner ASSY V-RI
05-07 $193.31 $151.09
Maintenance & lubrication - Engine service - Belts & pulleys - Serpentine tensioner Serpentine tensioner, tacoma, 4.0l
05-07 $118.78 $92.83
Maintenance & lubrication - Engine service - Belts & pulleys - Serpentine tensioner Chain tensioner, tacoma, primary chain - 2.7l - 2.7L
05-07 $26.44 $20.66
Engine - Camshaft & timing - Chain tensioner Chain tensioner, tacoma, secondary chain - 2.7l - 2.7L
05-07 $26.46 $20.68
Engine - Camshaft & timing - Chain tensioner Chain guide, tacoma, primary chain, tensioner side - 2.7l - 2.7L
05-07 $44.24 $34.58
Engine - Camshaft & timing - Chain guide Chain tensioner, tacoma - 4.0l - 4.0L
05-07 $70.59 $55.17
Engine - Camshaft & timing - Chain tensioner tensioner, tacoma - 4.0l - 4.0L
05-07 $37.44 $29.26
Engine - Camshaft & timing - Tensioner tensioner, tacoma - 4.0l - 4.0L
05-07 $79.71 $62.30
Engine - Camshaft & timing - Tensioner Belt tensioner - 4.0 liter - 4.0 liter
05-08 $118.78 $92.83
Cooling - Belts and pulleys - Belt tensioner


They give you a parts diagram for each, but none of them seem to be the whole assembly, just individual components.