Picture thread showing w123 nut and bolt sizes

[Sev]

I'm wondering if anyone knows of a discussion thread somewhere on this site that shows pictures of the fasteners in engine bay, and all of the specific names/types of nuts and bolts, as I'm trying to replace many of the dirty screws, bolts and hardware with new good quality zinc plated fasteners, without doing it one at a time and figuring out name of bolt and exact size

[Sev]

unrelated question: can someone supply me the part number of the L-shaped bracket which holds either the diagnostic port pictured or the tachometer amplifier?

The bracket to which the L-shaped bracket attaches is part number 1235452240