if it is for a pony or donk try the safari type synth saddles we had 1 for a shet and i found an adult sized similar type to break in the bretons with as they have adjustable saddle pads to allow for the ins & outs of a fatty throughout the year.
i got both on Ebay uk, i use a courier firm who are cheaper than parcel farce or post office, i can send you their details if you like?
good luck