The complete gear kit was exactly as described and included everything needed to overhaul a worn out assembly. The link to the YouTube video was indispensable. The only small glitch was that the video didn't emphasize was that the plastic sprocket dust cover mounting holes require that the assembly be installed so they line up front to back. I put my opener all back together only to find that the dust cover holes were not where they needed to be. Had to fabricate my own little dust cover from a plastic cup and double stick tape it to the unit. Not pretty but it does the job. Small complaint.
These rail fasteners were better than the originals that were installed on my garage doors when our house was built. Preferred Doors shipped the replacements promptly and without any issues.
I couldn't find a local door company that would sell me springs without the installation service, so I looked on the internet. Preferred Doors had what I needed at a very competitive price. Their customer service was very responsive, and I had my springs in less than a week. I installed them the next day, and my garage door is back to working as it should.