72 demon 340 struts?

hi all. i removed the struts from my 72 demon 340 and one was a little bent and the shaft where the bushings go was a lot corroded. i also noticed that the two struts are different. one is fine thread and the other is coarse thread. is this normal. everything looked factory.
the fine threaded strut is the one i need to replace, so if this is a easy to find part....let me know. and if anyone has one that they wanna get rid of..let me know. thanks