Spark Plug Wires- 1993 Cutlass Ciera

I'm trying to change the wires on my 1993 ols cutlass ciera, which has a 3.3 V6, and there is a little plastic guard on over the wires on the front three wires. I cannot figure out how to get that plastic guard off. It is about an inch wide and 1 1/2 feet long. I've tried pulling up on it, and just broke a piece off, I can't pull out on it, because there is a mount in the way. If you can assist, i would be most appreciative.

It mounts on two vertical pins. Pull straight up, to remove from the pins.