Question on TBody Spacer

I just got the Motorvator tbody spacer. Now doing what I should do before I jump to installation, I was inspecting the parts sent with the parts list. It seems there should be 2 linkage plates, and I only received 1. I have every other part except 1 of the linkage plates.

To those that have a spacer, are both plates necessary? Or is it just a typo on their parts list? It says 2 on the list, and in the installation it says it needs 2 linkage plates also. This is for a 2002 Auto V6.

Thanks in advance.

I'm preparing my engine though. I'm getting a bigger tbody next month, as in February I am ordering my Procharger.

Also, not every mod is about trying squeeze every ounce of power I can get. I've seen cars with spacers get better gas mileage, so if I can get +1mpg out of it, then I consider it a worthwhile investment.