Grab a sharp knife and a piece of foam rubber thick enough to squeeze tightly between the top of the transmission and the floor pan, and you can whittle out half a dozen of them in a few minutes. It's not likely anybody is going to call you out for not having exactly the right shaped part in a place that can't be seen!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!