I ordered a 372Xp that came with a 18" bar&chain , I went ahead and got a 24" bar too with 2 chains and 4 more 18" chains . Now that i am looking at every thing i had got ..........The 18" bar says 18" 68DL 3/8 58 the extra four 18" chains say on the packages 18" 3/8 50 . The 24" extra bar i got says 3/8 84DL 50 and the packages of the two 24" chains say the same . Help?