Transmission drain plug

[nino]

My drain plug is stripped out (manual), I'll be able to get it out but I'm having trouble figuring out the proper replacement plug. Realoem gives me:

12 Screw plug M24X1,5 1 23117546876 $12.63

When I look that up, and with a google image search, I am seeing pictures of an external hex head, like here:
http://www.turnermotorsport.com/p-75...-bmw-part.aspx

Mine is an internal hex and, I'm pretty sure I've always seen an internal hex on all the e30 trans I've seen.
This is apparently a special order part so I don't want to order the wrong one. Whats the deal? Does anyone know for sure? Or have a spare one to sell?

[kronus]

there are internal ones and external ones. you can snag one from a junkyard to make sure you get the right one, most are internal.

[kronus]

(but both will fit into the hole)

[jlevie]

Either style plug works and both have been used by BMW.