ATLAS GP-40 FEMALE FLYWHEEL UNIVERSAL PART HELP

OK, need part # 850111 for an Atlas GP-40.

This is the female universal that fits inside the flywheel. Not in stock at Atlas!

Mine had come loose inside the flywheel, while pulling it apart to repair, the universal hit the floor, and was eaten immediately chewed and swallowed by one of my pugs!

Can anybody help me???!!!

Is this engine HO scale, N scale, straight GP40 or 40-2, Trainman, Silver/Gold series, Atlas/Roco, or ?

Will this part substitute https://secure.atlasrr.com/mod1/searchresult.asp (920111)?

It is an HO scale Red Box GP-40