I can see daylight out the back of my Leisure Manhattan 55 !?!?

I just bought a secondhand Leisure MAnhattan 55 cooker, and at the back of the oven, the gas jets are not covered with anything and there is a big gaping hole at the back through which I can see my kitchen floor!

I think maybe there is a panel missing that is supposed to cover this area up. There are two lugs in the base that look like they wuold ahve supported something like that.

Will my cooker work without this panel?

Does anyone know where I could get this panel from?

Ive just travelled 600 miles to collect this cooker, so I'd be EXTREMELY grateful if anyone can give me a clue how to fix it!

Thanks in advance

Steff