IH 75C Oil drain plugs

[dcast10]

Need to change the engine oil on my "new" 2014 75C. What size allen wrench do I need to get the drain plugs out? Seems to be 7/16 or maybe 11 or 12 mm. Of course my set only goes to 3/8 and 10mm.
Thanks

 

[dcast10]

The drain plugs take a 12mm hex head. I will have to see if I can find a bolt with a 12mm head and some nuts to make an adapter. If not, I know I have a punch with that size shaft I can cut down.