To add to the previous hints, sometimes the hole spacing for the two allen bolts in some aftermarket replacement engine mounts aren't drilled exactly right. you get a situation where you can get one of the twp allen bolts started into the crossmember, but then the other bolt wants to crossthread. You may need to slightly enlarge or elongate one or both mounting holes in the mount with a drill in order to make the mount fit.

Happy Motoring, Mark

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DrDKW