By your pictures, I believe you have a SU-H Machine. Undercounter high temp dishwasher built by Stero. What your showing is the booster element. As part number and sources change over years of production, the part may change number and be slightly different. This happens in all brands. As long as the voltage is correct for you supply, and the length is not longer than the booster, And the flange is the same. You should be ok.
The best way to confirm is to start with the original manufacturer part number for your machine. Then check for cross references of that number as they become obsolete. If you have the original part number, you can enter it into PartsTown’s search box and it should come up directly or with a obsolete tag. It Will then list a replacement number if available.
Be aware that TechTown is just a forum of volunteers that work in the trade to help others find answers to questions about equipment and further their knowledge. If you have concerns about the part being the right one, Call or contact Partstown directly.