None taken,, made some back 1986 mounted n-50s tire shop mounted &balanced them,,had them on 75 dart 6cyl. 80m.p.h. no vibration.6 was straining 3.23 posi certified pipe welder 30yrs. welded everthing from the crack of dawn to a broken heart..pipefitters local 162 dayton.. No shells to buy back then..I would sugest to buy some..that`s what i`am gonna do if i mak e any more