We have them for sale at work (Advance Auto) for a variety of different size filters. In my store they are right next to the filter rack. Find the filter you need and match it up to the wrench. Can't recall the price, but it isn't more that 8 bucks. Ours are made by Ampro. I have 2 myself and they work as advertised. Takes a standart 3/8 drive ratchet and extension to use. For my 4.6 V8 I find it easier to use with a 6" extension, then a swivel, followed by another 3" extension to get to the filter easily. Good luck!