Rotax 582 Year of Manufacture

[JustPlaneMike]

Greetings , I have searched everywhere and can not find. I'm looking for the year of production/ or Manufacture date of the following 582 model 90 Grey heads
3971307
4105293
Thanks

[avidflyer]

if you search on Rotaxowners.com Rotax-Owner.com - Forum (rotax-owner.com) (https://www.rotax-owner.com/en/forum) and you look in the search function, you probably can find a post the comes real close to your serial #. JImChuk

[JustPlaneMike]

if you search on Rotaxowners.com Rotax-Owner.com - Forum (rotax-owner.com) (https://www.rotax-owner.com/en/forum) and you look in the search function, you probably can find a post the comes real close to your serial #. JImChuk
Thanks , Been there done that for several hours before I posted this. Posts in Rotax Owners .com where I'm a paid member, post after post of requests for year of manufacture. Replies were answered for them but no where was it advised where to look up. Also went to Rotax .com the manufacturers website, and only search feature was engine configuration, did not show date of manufacture.