Hi all, please can i get some help my 266xp (OEM 501 6855710) top end has drop a ring. i am having trouble getting any cylinder kits but there seems to be a lot of the 268xp kits with al most the same OEM number will they be compatible, EG Cylinder Kit for HUSQVARNA 268 268xp 50 mm OEM 5016585-71 by METEOR. thanks for any help.