I purchased the head from sun valley mercedes dismantler's in los angeles ca. which is only a few hour's from where i live,the head was from a 91 which had the newer style cam and rocker's,i used the cam and the complete rocker tower's with the rocker's on them just put them in the same order they came from the used head,also the tower bolts were threaded all the way up which indicated newer style,it was so easy to do and what a difference the cam and rocker's looked almost like new,the lifter's took a while to pump up because the head was sitting for a while but started right up and quiet as a mouse now,i didn't even pull the tensioner,i just wedged a big screw driver between the chain before i pulled the cam gear and chain off ,of course i put it on tdc first and marked the gear and chain with white out and left the gear on the chain, i rolled the c-clip in front of the cam up to the top and removed it and lifted the cam up and back to pull it through the gear (piece of cake).