What is the throw out bearing seal material?

Probably one of the thousands of available Synthetic Rubbers (e.g., Fluorelastomers) :

http://www.industrialrubbergoods.com/fluoroelastomers.html#:~:text=Fluroelastomer%20or%20FKM%20is%20a%20class%20of%20synthetic,single%20entity%20but%20a%20family%20of%20fluoropolymer%20rubbers.

Are you just trying to find a less expensive source?

 

Green O Rings are hydrogenated Nitrile, also known as highly saturated Nitrile, or more commonly known as HNBR. These O Rings have the green color moulded into the rubber and were introduced with the refrigerant of 134a, suitable for high temperatures and fluctuating stress loads.

Starrting arourd 1987 when new rubber compounds were being used for O Rings, colors were added to the rubber to help identify them. Prior to that, all O Rings were black. One could not identify the type of rubber just by the color.

 

I'd agree that that's generally true for orings, but as this oring supplier states:

**Disclaimer: It is never safe to assume an o-ring is a specific material based on the color alone.**

https://www.globaloring.com/oring-colors/

I'd add that the greenish/bluish seal in the OP's photo doesn't look like an oring round cross-section.

 

The blue/green ring is likely teflon (or a similar polymer). I'm working with some of those now. Not the easiest to work with. If anyone has some tips on installing these, I'm all ears. Image Unavailable, Please Login

 

That probably won't be so easy. Even if you get the same material (or an appropriate material) in the right size and shape, all of these elastomers come in different hardnesses from squishy to an almost hard plastic feel (so that's another thing to match up). Based on Tim's comments (and others people have posted before), I'd guess that the greenish-bluish seals would be toward the harder (less flexible) end of the spectrum.

 

For certain things I’m a firm believer in buying oem. This is one of those. Just pay the Ferrari tax. I went through 2 rear main seals on my testarossa before just buying one from ricambi. Bought my throw out bearing seals from them to avoid having to redo it. I’m a master at pulling the clutch housing now though.

 

I would agree. There is no benefit to trying to find an alternate if the original is available and especially for relatively inexpensive "wear and tear" parts like seals and o rings. I have been forced to make the odd gasket in my time though.....