I guess since the previous mount withstood time with 3 bolts then this should be fine until you can get a replacement. I'd drive easy though. Do you have a Lowes etc nearby? If so take the bolt that fits and get a stainless metric M8 or M10 bolt of the proper length. I wouldn't worry about exact Porsche replacement for now as just about any Chinese bolt is going to be stronger than the soft aluminum cheese the engine is made from.
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