Hi. I hope someone with a little expertise can help me! I have an old porch awning (burgundy in colour, Inaca is the brand.....think it is possibly a Stardust model) that I was going to change for a bigger awning. However, before I do, I was wondering has anyone ever added an annexe to a porch awning and if so, how do you know what size to get? Are universal annexes actually universal? I know Inaca do make annexes still but they are much newer than mine and I have no idea how to tell if they would fit. Any help whatsoever would be appreciated! Many thanks.