you can get them custom made at u bolt shops or i think
www.mothertruckers.net sells them as well as other vendors....
the sawzall will probaly cut them but will take along time..... a grinder would work good
i had a set of a arms that i tried heating up and beating with a 15 lb sledge FULL sling to........ they wouldnt budge....... sometimes they are just rustowelded