Need Engine for L4850

[moremotor]

I have a 1991 Kubota L4850. The engine is a F2503 5 cylinder. It threw a rod. I have been unable to locate another 2503. I was wondering if the F2803 or an F2302 would work in its place. The tractor has the oil pan which supports front axle bracket. Any help is appreciated.

 

[moremotor]

Does anyone have knowledge of interchange of Kubota 5 cylinder engines. Will the oil pan from a F2503 fit on a F2803. Thanks