Battery for key ( 1986 )

I am having a hard time finding the right size battery for the key?? Any ideas online?

I would expect one of the 928 vendors would be able to answer, unfortunately I don't know offhand. 928gt.com 928intl.com 928srus.com (in alpha order).

Thanks, looks like energizer #389 ( 2 batteries ), one on top of another might do the trick. I went to the rennlist and found the post. Thanks again for the info. Jeff