D7 bleeder screw socket?

does anybody know what the tool is called or where to get it that fits the rectangular bleeder screw behind  the injector connections? they're in such  close quarters that i can't g et a lock wrench or anything else on them. I've searched "rectangular socket" and "oval socket" but nothing comes up.
thanks.

Chapter 19 (AU) sells a repro one. There is a socket similar to a "D" socket that will fit but I do not know the number or the supplier.
The Chapter 19 one is at the bottom of their repro catalog.

I believe the Cat # for the little socket is 5P-2682 for about $15.  I think it is 1/4" drive

bingo! "D socket" turns up some good possibilities. Thanks!

This is the Bleed screw tool Chapter 19 sells
 [attachment=71898]Screenshot_20230418_092632_Word.jpg[/attachment]

Regards 

ive got a genuine one and no you cant borrow it.

wouldnt be hard to make one though.

got the good one!
Following up on my quest for a socket. . I found a D socket that didn't give any dimensions but looked to be about right for $11. I gambled and it turned out to be too small by about the thickness of the chrome plate.
so then I found one on ebay using the part # D4Jim provided. It's exactly the right one, as one would expect from the part number. $26.45 free shipping. took a while to get here but worth the wait. I put a1/4 extension on it and will do the bleeding eventually.I let it run empty of fuel is why i need to bleed.
many thanks to all the commenters! It was another learning experience for this shade tree mechanic.