A statement of compliance from BMW would confirm date of manufacture, which LTSA would use (Which I have just done on another car)
Anyway, is looks like it has been sold!
If anyone is interested - 1987 E30 in Japan
http://www.tau-sales.com/defaultMall/sitem...?GoodsNo=237100
As it is 20 years, you can import & don't even need to convert it!!