Correct insert for Domke F803

Hello,

I'm wondering if someone can advise me on the right insert to get for my F803. The supplied insert is fine, but from the others listed none seem to be the same dimensions they're all a little deeper, so I'm worried they wont fit in the bag correctly. There's one shorter heigh insert I've seen which is meant for a rangefinder sized camera and I'm wondering if this is going to fit.

Any advice would be great.