Hi I asked this question a while ago and someone had one spare, but by that time i had my old one rebuilt! so he may still have it. I thought at the time that there were lots the same from that era but they are all quite different,
mine was rebuilt from a complete wreck because you can still get the armature new from http://www.woodauto.com/ just look up the number on the old one and do a search for it.
here is my original posting.
http://66.129.69.181/forum/topic.asp?TOPIC_ID=919&SearchTerms=starter
hope it helps
Ian