Need help with replacement of complete awning

[05 Monty]

Hi,
We have an 05 Montana that we purchased in the fall of last year.
When we purchased it the main awning had been removed.
We would like to install a power awning into the same location as the old manual awning(I assume it was manual) Can anyone recommend a brand or store to help with this? We purchased one and had to send it back because the portion that attached over the neck of the camper was to tall.
Any help would be apprectiated.

Thanks,
Joe