Replacement needed for bent and buggered Exage country rear mech that will be coming off an MBK 'Adventure' with a full Exage 'country', bio pace component package,frame is a garish orange to yellow fade with 'shellsuitesque' graphics, anyone know if my bike is an '88 model?(spec looks just like in picures of an '88 Kona fire mountain) May consider a minor upgrade on the Rear mech as long as its cheap! Hope I kind find one cos the rest of the bike's in good nick.