Chase size

I have a Jones Press and I’m new to the world of vintage press printing.
Trying to determine size of a chase for the Jones Press. Platen paper plate measures 8 3/8” x 14 1/4”.
What size chase should I be looking for?
This press sat outside for 8 yrs. and after a little work I now have it working smoothly, determined to learn printer terms.
Anyone can help in finding what size chase I would need?
Thanks

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Could you post a picture of the overall press, and another close-up picture of the area where the chase fits into the press (called the bed). Then we will be better able to make some suggestions.