I've got 5mm packing under my front mounts and a 3mm home made shim under the gearbox rear mount. The sierra mounts do go soft and have poor lateral stability. There is a BMW mount of very similar dimensions to the Sierra or if you're really feeling flish there is a Sierra Cosworth mount from Vibra Technics at about £112 each, it seems very good and is designed to improve lateral stability. I was talking to them at the Autosport show in January, however the price keeps bringing tears to my eyes. Mark Burtley will tell you exactly which the BMW one is. My engine moves too much sideways on track days and I need to solve this soon, so will probably try the BMW ones myself. Nigel
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