I'm replacing my freeze plugs and I bought a brass plug kit. There are five plugs in the kit, four are brass colored, one is silver and slightly larger. From what I can tell the 5 plugs I popped out were all the same size, and it seems like the bigger silver one won't fit in any of the holes, at least not as well as the smaller size would. Has anyone swapped freeze plugs before? Do you know for a fact if one plug is supposed to be bigger and which hole it belongs in? Or are they supposed to be the same size and the kit I bought had a wrong part in it? Thanks

 

If I am not mistaken those two go to to the back side of the engine. One in the block and one in the head.

 

Conveniently located behind the trans. bellhousing.