[urq] 4000 mirror compatibility

[Mike Fitton]

My outside right mirror is cracked pretty badly.  This one's not 
rally-related...more of a 
stupid-roommate-shot-it-with-a-paintball-gun-related.  I was quoted $45 
for a new (used) authentic urQ glass, from Dad's I think.  But if the 
4000 glass will fit, I'll just hit up my local junkyard instead.  I 
wanna keep the heated aspect, for authenticity's sake...will there be 
any problems there?

-Cheers!
Mike