The part numbers that begin with 900 are all DIN standard parts. Porsche published a cross reference back in the 60s, I think, at the time they were converting from a previous parts numbering system to the one you see today, which they share with VW/Audi. So for example 900.075.001.00 is a DIN 933 spec bolt, M5 x 8 mm, and anything beginning with 900.075 is DIN 933. The last two digits (eg, 00) indicate the material (first digit) and finish (second digit) type.

For your project, Trem, you can acquire quality DIN spec hardware in the US from sources like Bel-metric and Wurth USA, and it can make sense to do so if you're buying in at least some quantity (tens rather than singles). There are places that sell pre-packaged kits of common sizes, too. For the onesies, I'd stick with Porsche or VW/Audi. I wouldn't as a rule use hardware store fasteners for critical applications on a car: there is too much counterfeit junk out there. Good luck with your project!

Interesting.

Thread I stumbled on...Someone detailed the early 911 fasteners:

Porsche Fasteners - Nuts, Bolts, Screws and Washers

Built a website for buying fastener packs here:

https://www.thenewgarage.com/1965---1969-porsche-911-912

Ben is a good guy, met him at Hershey 2 years ago. He gave up the idea, couldn't get reliable plating and margins were low. I've done a lot of personal plating for him since then.

I wonder if he would be willing to relinquish the specs he compiled. The world runs on open-source software, after all...

If you Pm me your email I'll send you an email of how to read the codes.

Sent. Hope it helps you.

I also highly recommend Bel-Metric, as Shaun mentioned. I used them for most of the fasteners on my previous build. I would collect a list of all the fasteners I needed as I worked on the car over the weekend, submit my order via their website on Sunday night, and have the delivery by Wednesday - ready for the next weekend.

+1 for Bel-Metric. User friendly website to boot.

So finally got over to Belmetric and it is a fantastic source for metric fasteners. The specs they have are extensive, and make it much much easier to map Porsche descriptions to actual fasteners. A lot of them come in yellow zinc, too, if that's your thing. If only they had rubber/plastic washers...

Sure wish I'd taken a closer look before. Thanks!

Another cool thing about Belmetric is how fast they are.

+1 Belmetric. I got tired a chasing around trying to find good hardware that had the wrong finish and looked blah. I ordered a whole pile of yellow zinc plated washers, bolts nuts, etc. Took about 5 days to my door. Hardware looks really nice. Redid the new engine mounts.

Bolts, washers, nuts. I hate lockwashers....
http://forums.pelicanparts.com/uploa...1501022262.JPG

New hardware but not plated
http://forums.pelicanparts.com/uploa...1501022506.JPG

New yellow zinc plated
http://forums.pelicanparts.com/uploa...1501022506.jpg