E Track End Plug Cap (10 Pack) - Heavy Duty Rubber Protectors for Cargo Trailer, Truck, and Van E Track Accessories - Secure & Durable Fit for Transportation Safety

If you install this end cap, you will lose the use of the last slot on your E-Track.Also, it is too thick, and does not allow the end of the track to sit flush.I installed it, and then ended up ripping it out and throwing it away.I feel like I was ripped off.Seriously, designing and manufacturing this stuff is not rocket science, but these guys still managed to screw it up.