Well....looks like no one is going to ring-in on this one so I'll give it a shot. This is speculation on my part but who knows...I might be right.
These tools with the "J" prefix were made by the Kent-Moore company. There were many more than just the 3 digit numbers and were made (my guess here) for the auto manufacturers (not just Hudson) as special tools for their specific service needs. So far, I've never seen a "J" tool that wasn't intended for some particular make/model-specific task. You may notice some KMO tool numbers as well. As far as I can tell, those were general tools (like a guide reamer, tubing cutter, etc.) I think KMO is Kent-Moore Organization. They are still around doing the same thing but, of course, the numbers you see in the old Hudson manuals are obsolete. The only way you'll find them is the usual sources for that kind of stuff.....swap meets, Ebay (yuk) or blind luck. The other choices are to find common tools that will do the job or make your own. I got tired of waiting for a J-2729 oil pump installation/alignment tool to drop into my lap so I did just that. It works on any of the pressure lubed sixes and saves a pile of time and frustration.
Hope you can find what you need.
Frank

DON

YES I HAVE 2 BOOKS ONE DATED 1940 IT IS A HUDSON BOOK WITH A APPROVED EQUIPMENT IT SAYS HINCKLEY-MEYERS A DIVISION OF KENT-MOORE IT HAS ALL KENT-MOORE TOOLS IN IT MOST ARE MADE TO WORK ON ALL CARS BUT THE CLUTCH SECTION IS HUDSON ONLY I ALSO HAVE A 1950 KENT MOORE BOOK WITH 1950 EDITION FOR HUDSON ON THE COVER I GOT OFF MY BUT AND FOUND IT IN ONE OF MY FILEING CABNETS I ASK ALEX TO SCAN IT SO EVERY ONE COULD USE THE INFO HE SAID YES WHAT A GUY I DON'T KNOW WHERE WE WOULD BE WITH OUT ALEX AND GUYS LIKE HIM
********THANK YOU ALEX FOR ALL YOU DO 🙂 ********
HUDSONLY
PAULARGETYPE

Paul,

That would be great material for the group, thank you!

Frank,

Thanks for your insight, i have allot to learn and your explanation is helping me down the path!

Don