Timing Belt Tensioner:
The VX and the EX/Si tensioners are the same and are nothing like the one on the D15B VTEC. The D16z6 tensioner is almost the same as the D15B vtec except that it has a slightly larger diameter roller as you will see in the following pictures.
I want to say it is safe to use the tensioner for the VX/EX/Si despite the larger roller. All the autoparts store I went to did not have a tensioner for the VX in their database--O'Reilly's, Autozone, and Advance Auto Parts, so stupid me went to the Stealership and ordered one only to find out it's the same as the EX/Si tensioner. The price was twice as much as the ones from the autoparts store, but it came with a new tensioner spring. The tensioner off a D15B7/8 will not work.

Z6/Z1 top, D15B middle, D15b8/d15b7 bottom

Z6/Z1 top, D15b vtec bottom

D15b VTEC tensioner on with VX timing belt. Pay attention to the tensioner spring.

Z6/Z1 tensioner on with VX timing belt. The tensioner spring is stretched further. I'm hoping this will be okay since I'm going to be using it.