Had my factory keyless entry remote stop working in my 92 the other week even after replacing the battery. So after searching the forums for a factory replacement I found
keylessride.com. They currently have 2 replacement choices for our SVX: a similar square FOB w/2 buttons and a round FOB w/2 buttons. I choose the round remote and the total for me was $45 shipped. Its similar in weight and a slightly thinner profile. It comes with programming directions specifically for the SVX, has a red indicator light, and both buttons do the same function after programming them to the SVX. Pic below shows the size reference.
So far it functions the same as the old remote. No added range unfortunately. Worth purchase in my opinion.