Dana 60 under 73 swinger..need id

So I picked up the start a few years ago finally got around to the restoration


EDIT....( after looking through about 400 pictures on Summit and the guys on here I have determined that this is a shortened Dana 60 6 lug. 55 wms
27 " 30 spline
with
1975 Toyota 1/2 ton pickup --backing plate / 10 inch drums/ bearings)


As you can see I'm going to have a real issue matching Wheels LOL
I know a little bit about differentials here's the story I turn the wheel One Way both Wheels turn not sure what kind of locking device this would be any help would be appreciated
I have no history on this axle

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