Adjuster needed on an alternator replacement?

[Clio 1.5 dci]

I'm sending my car into the local garage for an alternator and belt replacement. They've advised me that Renault usually sells them in a kit, and suggest the 'adjuster' to be installed too. The kit costs about £60 or so. I'm just questioning to myself if this is necessary? Of course, the garage will do whatever I ask them, but I don't want something catastrophic happening to the engine.

I'll also be arranging for the camblet replacement at a later date, if this makes any difference

 

[Dan@SJM]

Yes. 100%. The aux belt fires it's way into the cam belt 9/10 times and wipes out all the valves.

 

[Mr R.]

It's nice to hear for once that a garage is recommending that it be replaced. [emoji106]

So many times this is over looked.