Sounds like you just want a replacement rather than a rear axel ratio change. If that is the case you might well be limited. No responses just might be because nobody really knows that read your post.

Your model was kind of the lightweight series. A 300d of a simular vintage may be simular. I know nothing about if it is or the ratio is what you would want. Thats probably the one I would check out though.

It is also a possibility the gas 190 rear ends interchange. I suspect the ratio would be far different though. So impractable even if they fit and I imagine they might. You can check the two ratios for comparison though.