You can buy just the hardware if that's all you need. Here is a link to the A&E hardware sets. http://www.pplmotorhomes.com/parts/r...rdware-a-e.htm
And here is the link to the Carefree Hardware sets.
Trailer Awnings - Spirit FX Series by Carefree - PPL Motor Homes
Both are sold under a seperate part numbers so if your guy ordered a new Awning he would also have to order a new hardware set. I'd get another guy to look at the problem there's no way he can't know about this. If your Awning isn't damaged then he's looking to sell you more than you need.
If it's just the hardware, and not the roller, you can do it yourself without a lot of tools or even skill and save a bunch of labor costs. He hardware kits come with very complete instructions, at least the A&E ones, I've never done a Carefree Kit but the over the door Carefree had good install instructions.