89? TE510

Looking for advice From Australia on what I believe is an 89 TE510. Head is off as it dropped a valve after being rebuilt years ago. Trying to find a new / s/hand head for it.. what I am unsure about is from what I have read there is 2 89 models with different heads. An A and a B? one late 89, one early. My number are engine 2223 0658. Frame 7TE 001425. Is there a way to identify what year heads will fit? I found a 90? head of a bike with an L vin code frame and a June 89 build date. will this fit? Also all the links to manuals in the tec sect are broken, anybody able to point me to a service manual please? Thankyou

Source for manuals:

http://www.3medesign.com/technical-data.html

Also, this may be of interest:

https://www.husqvarnaman.com/oldhome


If indeed it is an 89, posting in the '4-Stroke' section may yield more and better information.

I need to check tomorrow to make sure we still have this as I may have forgotten to un-list it...