For what it's worth, those looking to add Lift The Dots to carpet will quickly learn that the traditional/standard size Lift The Dot has tangs that are only .200" long. Great for canvas but not quite long enough on carpet.
Most vendors do NOT supply the longer tang .275" Lift The Dot top portion. Trust me, I called quite a few and finding someone that will sell you small quantities is not easy. Maybe you will get lucky from a local boat canvas supplier.
Or you can contact this guy. Jim Watt, owner of Northwest Tarp & Canvas in Bellingham, WA. He will sell you small lots (5-10 qty) and for a very fair price.
www.nwtarp.com
His contact number is 360-296-2321. He has many ads on eBay but may not have these exact ones listed there at the moment.
But he does carry them and he's simply a great guy running an honest business. Check him out...I have nothing to gain personally but just want to share a great resource for a difficult little item to source quickly (and correctly, as there are knock-off versions out there).