I'm looking at replacing a wide array of nuts, bolts, screws, and washers on my frame due to them being rusted out and I've broken a handful. I'm using the parts manuals and the DMCH website, and then referencing the parts numbers across DMCH, DeloreanGo, DI, etc - but I've found that nuts and bolts from regular online sources is insanely cheaper, like 80%+!! Of course, I can't go and order random bolts and hope that they fit, so instead... I'm going through every nut and bolt that I've pulled off the car and measuring each one. I have done some searches, but haven't found anyone who has done this at a large scale on the car. Since I'm doing a full frame replacement, plus refurbishing the suspension and brakes, I'm going to cover a large portion of the car and I've got probably 100 nuts & bolts sized so far.
As an example - SP10223 are the bolts that hold the torque converter to the flex plate (auto transmission). The sites list the bolt as M10, and have a picture showing its roughly 3/4" long and A2 stainless, and the price is $5.51. I measured it - it's M10-1.5, 16mm long, and I can buy a stainless A2 replacement for $0.59 through BoltDepot.com.
Likewise, in a pinch if someone needs a bolt to get up and running and doesn't want to wait 3 days for shipping, they would be able to walk into a Lowes or Home Depot or whatever is nearby and pick up a replacement.
Would this be helpful to have as a resource? Is there anyone who would be interested in collaborating on it?