ferrit

Hi all hope you can help me with this , im looking for a cdi unit for my 1986 dt125lc mrk 3 ive tried numorouse breakers and cant find one anywere ! i dont wont to pay top doller for a new one i didnt pay much for the bike so dont wont to go stupid with parts if you get me . Or can i use a cdi from a different year ? any help will be great many thanks Ferrit