I was in the same situation, with a 1994 Sovereign. The heating element went out and couldn’t find one anywhere. I had given up and after seeing this post, decided to try a different element. I wanted to get the exact specs for the original element and when I searched for it, I actually found someone who had them in stock! SpaPartNet.com
https://www.spapartsnet.com/ProductDetails.asp?ProductCode=31255
Ordered one on Sunday, it shipped on Tuesday and will be here Friday! Get one while they’re still in stock!