For the few of us with Universal engines, here is how to find parts.
Get Kubota block number, located on block near the injector pump.
With block number, find engine model (see attached cross-reference pdf), then goto Kubota site for parts diagrams to find tractor model
https://apps.kubotausa.com/illustrated-parts/
Shop for parts using tractor model as the reference
If the block number is the same (i.e. v1902), the parts will bet the same between M50 and 5444
There might be a difference in the marinized parts that Universal added.