Re: Saddle
I too have an Irish cob, now retired, but she had a wide Thorowgood, which was the only one we could get to fit her at the time.
As TruStar says, tho, these days you can get the changeable gullets, or have you considered a treeless?
Due to recently getting a loan horse with very odd conformation, we realised that the best way was treeless, and did a fair amount of research, and there are several companies who now make what looks like a traditional saddle, including dressage cut, but are in fact treeless.
Here's one website, but have a look on ebay as well.....good luck xx
www.easytreksaddles.co.uk