As you would hold the crossbow in the shooting position, look in the upper area of the "J" groove section where the cables go and see if there happens to be a Teflon strip. If there is you would not need the cable slide. If there is no Teflon strip then a cable slide would be required or a Teflon strip. The Teflon strip is approximately 3/4" wide by 4" long. For my Ghost 410, I removed the riser bolt, then the riser. Next I removed the tiny bolts holding the "J" groove section. The Ghost 410 had a damaged Teflon strip. I cleaned the area where the Teflon strip was good. Gently peel part of the film off the new Teflon strip and starting at the back of the "J" groove section carefully center the Teflon strip and press it down as you go. Any extra, cut off at the front of the "J" groove section. Reinstall the "J" groove section. When reinstalling the riser, press down on the cables to prevent damage to the Teflon strip and carefully insert them into the "J" groove section. Carefully fit the riser then install the riser bolt.
Obtaining the proper cable slide and installing it is much easier than messing with the Teflon strip.
Here is a phone number where you can call Barnett customer service. Ph. 1-800-237-4507 Monday to Friday 8:30 AM to 5:00 PM Eastern Time. Their address is as follows:
Barnett Outdoors Inc.
955 Live Oak St.
Tarpon Springs, Florida
34689
If you have a dealer closer, you could call them. Just explain what you received and if that is an upgrade to what the manual shows.
All the best.