Massey Ferguson 135 injection pump question

I have a late 70's Massey Ferguson 135. It has the Perkins diesel AD3.152. I started getting a drip from the bottom banjo bolt on the injector pump. I pulled the bolt and it looks like it may have been over torqued in the past. My question is, my bolt looks like it's a pressure regulated banjo bolt and I cannot seem to find one. Any help would be appreciated. Thanks