I am trying to locate a set of torx screw bolts for this plate which according to Haynes manual are type 3 which are one countersunk and 2 pan head. Rimmers cannot help but thread diameter would be great. This plate must be removed to change the water pump. The countersunk one was very difficult to remove even after using heat to free the locking sealant as the countersink had bonded with the back plate. Sadly the pump I replaced has developed a noise so I will have to change it. Morgan 1990 plus 4 M16 engine. Plenty of this high tensile type of torx screw bolts available but I would rather have a set on new ones ready to fit along with tread lock.