Starting with the "Sabo".
This is a Model 210 Case that was made in 1980. It is the least expensive garden tractor made by Case in that year as it has a 4 speed mechanical transmission instead of the hydraulic drive that Case GT's are famous for. It should have a 10 hp Kohler K engine under the hood which likely translates to the 7.2 KW DIN rating you mention.
Surprisingly, this tractor has a J-series deck on it. The J is the very first issue and goes back to 1972. I would have expected either a K or L deck to be on this 1980 but perhaps the dealer had a older (but brand new) J-deck sitting around that he wanted to get rid of. The cut width is 44".
Originally, if sold here in America, it would be painted Power Red everywhere except for the wheel rims that would be painted Power White, the grille area and seat back that would have been painted semi-gloss black and the engine which also would have been black.
As I understand it, the Ingersoll's that were sold as Gutbrod's were painted an olive green colour. At least, that's what the one I saw looked like. However, different computers can alter the shade of any colour. LOL
The Gutbrod's made by Ingersoll were identical to the Ingersoll's made and sold in North America except for the colour and likely the decals. I can assure you that the red/white tractor depicted in the link you supplied is NOT an Ingersoll product.
Thanks for the link to the forum but even though I can trace my roots back to the fatherland, I have no German language skills. Is it possible for the person who is asking about the Sabo to post several photos of it on that forum? I'd like to see it.
If you use the link below, it will take you to the home page of Ingersoll. Click on the "Illustrated Parts List" on the top left side of your screen. The scroll down to where the tractors are listed and find the 210 models. Use the serial number to pinpoint which PDF is correct and click on that link. The original parts book will then be available to be printed or downloaded to your hard drive for free.
Parts are readily available.
Keep in mind that Case sold the outdoor power equipment division to John Ingersoll in late 1983 and from that date on, stopped supporting these tractors. Many of the "wear parts" are common off-the-shelf items, such as bearings, steering rod-ends etc.
If the tractor owner has excellent reading/writing skills in English, then Operator's Manuals, Parts Manuals and Service Manuals can be had quite easily.
As for on-line parts, you can check over this site. http://www.casegardentractors.com
The only negative comment I will make about Ed, who runs this site, is that he does not post a telephone number and he is really, really bad when it comes to answering e-mails in a timely fashion.
Cheers
Ingy