Here's the part#s for the correct glass for LHD. Ofcourse this is assuming you got yours from Japan and it's for RHD :
http://www.benzworld.org/images/frank/mirror.jpg
PS. I just got hold of the parts booklet for the 8G Galant. It's about 350 pages. If you need any JDM part and need the part #, let me know and I'll get the # for ya.