I know it's old... but incase anyone else is banging their heads against a bulkhead trying to find Universal M3-20B parts.
I spoke to Kubota today, and they could not verify the Kubota block for Universal M3-20B; I told him I read it was the Kubota D600... he said it's so old they hardly have any information. Giving them the engine
SN doesn't work as it's supposedly a Universal specific number (from when they bought it). As I only had the D600 to go off of, he sent me that IPB, many of the items seem to be exactly the same even same diagrams you'll see in the Universal IPB.
So here it is for anyone wanting it... and any better information out there please let me/us know
If the file doesn't upload (new here) email
me and I'll be happy to send it from gmail.