best one i ever seen was a starter tie wired on. No bolts just tie wire.
Saw a guy on time had his motor ratchet strapped into his truck and transmission chained in. And tried to say it was factory. I looked at him and said "it might be more believable if the straps did not say task force on em but rather GM".
That is what a reneck calls quick disconnect mounts, just like them there Nascar people use.......