Fired up my car this morning to go to work

SPIDEY SENSES TINGLING

Looked under the car to discover that the centre exhaust mount, the lever looking thing right by the tranny towards the front of the car has come off. Looks like there are three bolts that are supposed to be holding it together, and they have vanished.

Anybody happen to know what size/length bolts are required?

Thanks

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1978 300D