OM615 fuel filter banjo bolts
 

I'm reinstalling the fuel filter housing on the OM615 out of my '76 206D, and came across something I forgot to properly document as I was taking everything apart. I've got three banjo fittings on the housing -- but one bolt is different! Compared to the two others which have multiple large holes, one bolt only has one very small hole:
https://imgur.com/UYwYyVC.png

I currently have it in the line going to the injection pump input -- is this correct? Is this bolt even correct, or should all three have the same large holes?

https://imgur.com/1W3Hnx6.png

https://imgur.com/BVN1zy7.png

Small hole (restriction) should be on the tank return line.

That means it's the top one -- Thanks!

Would you recommend new brass washers?

New washers. Either copper or aluminum.