Numnah to fit 17.5" ideal jessica??

[Horseyjen!]

I have tried to get a numah to fit my saddle rather than a pad as i thought it would be cooler but i have tried a few different makes and none seem to fit. I asked in a shop yesterday and she said they are very hard to fit but its quite a popular saddle
I was wondering if anyone has this saddle have they managed to find a make of numnah that will fit?
Incase it makes a difference its a wide fit

Thanks in advance

 

[Chocy]

Nuumed fitted mine no probs. Tho I had 17inch & used a medium size was a very neat size so i'd say Nuumed large size wud def fit a 17.5