Many 124 and other models have a problem with the plastic Behr radiator neck snapping, which can cause disastrous overheating and engine damage. I bought this kit from Bergmsa motor works, which sells a lot of Mercedes stuff. The kit uses a copper pipe to reinforce the plastic neck, and includes epoxy (unopened), copper pipe section, and instructions. Turns out my radiator already has a metal reinforcement so I don't need this kit (should've checked before I bought it). If you don't have the reinforcement (you can check by taking off upper radiator hose where it connects to radiator; you'll spill about a half quart of coolant but you can see if the inside of the neck is metal or plastic. The kit is complete except I used the replacment hose clamp from the kit, but you can just reuse yours or get the same thing for $1 from pep boys. Sells new for $20 plus shipping; you can have it for $12 which includes shipping.