I had been told these wouldn’t fit on my S-350 base by another company. I ordered them from ZZZenSleep and they arrived promptly. Although the package had opened in transit and a few nuts and bolts were lost, the brackets were intact and I was able to get additional bolts and nuts at the hardware store. With a simple 5/16 drill bit. I drilled holes in my base and mounted these brackets. Everything fit perfectly, and I am pleased with my well fitted headboard!
