Grid/Pod gasket is key to your router's function, fitting into the channels under the spoilboard or in your point-to-point pods. Consider replacing it every 400-500 hours for peak vacuum efficiency.

With a caliper, measure both the width and depth of your table’s channels.  You want a square gasket that is the same width as the channel, so it slots in consistently.  As for the height of the gasket, you want it to stick proudly above the channel by roughly 1/16”.  For example, a 1/4” deep channel should install a 5/16” gasket.