Hard to find parts OMC Sterndrive

[dang84119]

I have a 1974 omc 120 sterndrive and have just had a head job done on it
and now I just have to find the adjusting nut and ball units for the rocker arms and it has been impossible to find them. I have tried to find them at all the auto parts stores, machine shops and gm dealers. I spent $260 on this and it looks like I can't finish unless somebody knows of an online store or somewhere in their town I can order and have ship. Please help.

[dang84119]

After the numerous responses from you guys, I found out on my own that that this engine is the same as the chevy 2 1969 and you can pretty much find the parts at checker, autozone, napa etc. although you probably have to back order them which takes probably 2 days or so. Thanks again!!