There are a lot of "Chelsea" brand PTO's on Ebay, mostly for recent-manufacture transmissions. It's possible they tried making a few direct/over boxes, didn't do their engineering just right, and had to do a recall.
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!