I have also seen the original spring loaded tentioner tip over under load and cause the timing belt to run on the very edge of the remaining pulleys causing timing belt wear. The item "Zetec Cam Timing Belt Kit Solid Tentioner Race Brisca RWD Conversion" is in sale since Monday, May 20, 2019.
This item is in the category "Vehicle Parts & Accessories\Car Parts\Engines & Engine Parts\Belt, Pulley & Tensioner Kits". The seller is "lukey916" and is located in Truro. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Czech republic, Denmark, Estonia, Finland, France, Germany, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Liechtenstein.