Within the past four days or so I done a search for sliding shower door guides. I must have searched between five and ten locations pulled up on search. I did not find what I was looking for. I did not see a stamp on the shower door of the manufacturer. I ended up making my own modifing a sliding door guide today.
Anyhow since that search when I go to different websites all I see is shower door guide ads. Must be online advertisers target the persons search inquiry and target site ads to your inquiry.