Oil pan bolts

[Dhos1]

where can I find the sizes for oil pan bolts. I'm replacing a few and it seems that there are a few that are different sizes

 

[turbofabricator]

All the bolts going into the block are 5/16-18 and the three that go into the timing cover are 1/4-20. Now with that said there are a couple of hybrid studs that have 5/16-18 threads on one side and 8mmx1.25 on the other to hold the trans cooler lines to the engine.

 

[X Ray]

Hope this helps....