I don't have a 250 thrust plate to measure, and no plans to acquire one anytime soon. If it's thicker, which I believe it is, a magnetic lathe chuck and a tool post grinder could be used to adjust the thickness. Some timing gears have a step built into them to establish the correct end play instead of a spacer.
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!