Why? Do you have a water leak. If so, the answer is yes. Save your money. Pull the old rubber gasket off about 12" on both sides of center and apply some black RTV sealant in the seal groove. Press it back on, wipe up the excess, and close the trunk.
Water has a tendancy to work itself under the bottom of the gasket, then up and over the metal trunk seam, then down into the spare tire well. At least that is what mine was doing. Acutally I found out normal rain would not cause a leak. Leaks would happen when I hand-washed my car and directed water stream directly at the trunk area where it meets the bumper.
2001 SSEi- black; stock 92K
1995 Vette; Competition Yellow; stock; 38K