As far as I remember, a Triac is a pair of transistors tied together serially. The 12L 87, I believe is a Date Code.

Searching the Internet, I found a pin out:

http://www.pinout.net/element_browse.php?conid=40642

Specs (in .pdf):

http://www.alldatasheet.com/view.jsp?Searchword=BCR8DM

And it looks like it is no longer made, but there is a equivalent: NTE5638 TRIAC-400VRM 8A TO-220

http://www.weisd.com/test/GenericParts_WEISD_view.php?editid1=BCR8DM-8

I searched Newark.com following a false lead, some other forum said they had them, they don't but thy do have equivalents:

http://www.newark.com/webapp/wcs/stores/servlet/Search?catalogId=15003&langId=-1&storeId=10194&categoryId=800000005452&st=triac%20BCR8DM&pageSize=25&showResults=true&pf=810021709,810050159,810087357,811880813,811880814

DigiKey, Mouser, others should have equivalents as well.