What is the best cheap ish saddle pad to get for a horse with back issues and a large gap between the saddle?

@lauryn_g she did have a brand new saddle but I don't have her anymore due to her having laminitis and cushings

Thinline. It's amazing I use it on my pony and she has had a better attitude since

Dover

You should probably get a new saddle lol… If your horse has back issues because of poor saddle fit, that's really unfair to your horse. There should never be a large gap between the saddle. Saddle pads should never and will never completely fix saddle fit issues.