This is the current exploded parts diagrams for Kubota engines. You need to know which tractor model your Kubota block was used in, then look up that tractor model in this Illustrated Parts page.
https://shop.kubotausa.com/oemparts/c/kubota_tractor/parts
Attached is a block --> tractor model cross-reference list.
KubotaModel-enginecrossReference.PDF