Spring steel pieces that clip into the oil drain back holes on the 230ci flat head

[OutpostM37]

These came on a T245A flat head 230 that I purchased a while back.
Does anyone have any information on these parts? I called John from MWM, he said that they were not used on the military engine and may be for a Civi 230.

 

[OutpostM37]

Here are the spring steel pieces in the 230 block drain holes.