Velodyne V-810XB Subwoofer Repair Kit with VA-907 Speaker, Passive Radiator & Gasket (FSK-V810XB) - Perfect for Home Theater & Audio System Upgrades

What I like is that it came with everything to replace the passive radiator too. I only did the subwoofer foam first since it was dry rotted then played it hard enough to blow out the passive radiator. Removed the old passive radiator and glued in the new one and installed the elastic band like the old one had. Let it dry overnight with some weight on the edge of the foam since it's glued directly to the subwoofer enclosure. Played it at medium sound level and it sounds a-lot better.