Anybody know what size replacement bolt or part number I'd need for a new camshaft position sensor bolt for a 2008 Vortec 4200 Straight-6 engine, I took mine out earlier to inspect if it was covered in sludge or varnish on the sensor, and the darned bolt fell in a place where I couldn't retrieve it and further attempts to retrieve it knocked it off somewhere, and I have no idea where it went, I can't find online what length and thread the bolt is or even find an ac delco part number, I even downloaded some service manuals and there was no help there.