The Screwed Nipples for the 617.952 Oil Coolers may or may not fit your Oil Cooler.
The threads on the 617.952 Oil Cooler Nipples are 22x1.5.

The issue with the Hydraulic Shop. What the Shop does is expected to be warranted. They can only warrant parts and assemblies they know are going to work.

They could be Nice Guys and hobble something together for you. If the Hose comes apart and destroys an Engine some People would take them to court on that. Time lost having to appear in Court also equals Money Lost.
I have also seen on those Peoples Courts where Shops did something to help someone out. If the charged for what they did the Judge held them responsible for the outcome.
The Judge basically said that the Shop making Money even to help someone out should not be more important then doing the Job correctly and that the Shop should have refused to do the job.

Summer. If you want to do a Job to Help someone out don't accept any Money for the Job. If you accept Money for the Job do the Job correctly or don't do the job at all.

In one of those 3 long Oil Cooler Hose repair threads one of our Members used and Air Conditioning Hose, the AC Hose Collar Crimping Tool and the AC Hose Collars.
That seems expensive but at least you have a nice Crimping Tool set left over from the Job.

Also on the 617.952 Oil Cooler Hose the Oil Cooler Hose ID size is 15mm. In 4 years of looking on the internet all I can say is US Hose Companies do not make this size of Hose.

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84 300D, 82 Volvo 244Gl Diesel