I bought these about three years ago and never used them. I opened the bag twice. I read the company that was making these for Redline went bankrupt. These are far better than the OEM ones. Neither ones seem to be available retail. I ended up with few used sets in good condition so I'll let this new one go.
Listed in ebay if anyone here is interested. http://www.ebay.com/itm/NEW-MERCURY-...77aa01&vxp=mtr