Fly sheet for cobs - what do you reccomend?

[Sandylou]

I have a 15hh flat back, low wither, deep & broad chest, short neck cob and want to get him a fly sheet. I have a 5' 9" Mark Todd Ultra Combo but it is just too tight around his chest and withers. I do like the Mark Todd rug and was thinking of getting the same again in a 6' but thought I'd ask you knowledgable people whether you know of a better one for the odd shaped cob?
Thanks peeps

 

[Supertrooper]

Premier equine - they fit cobs very well xx