St165 Oil cooler banjo bolt gasket discontinued, where could i get replacement part?

I tried ordering the oil cooler ring/gasket for my st165 on toyotapartsoverstock.com, it is apparently discontinued, anybody has an ide where I could find a replacement part??

It is a really simple part, just a little ring on the oil cooler banjo bolt...

Part # 1578588380

http://www.toyotapartsoverstock.com/images/parts/toyota/fullsize/MA9271.jpg

Maybe something like this could do?
(This is just an example - probably not the right size)
http://www.3sx.com/store/comersus_viewItemBundle.asp?idProduct=24331
:

Any ideas?

 

For anyone interested in final resolution, I ended up using aluminum crush washers from a plumbing website.
E.g.
http://www.anplumbing.com/Extras/Washers+6+O-rings-63.html

[TABLE="class: manufacturer_1, width: 550"]
[TR="class: odd"]
[TD="class: productId, align: center"]177008ERL[/TD]
[TD="align: center"]3/4[/TD]
[TD="class: description"]Aluminum Crush Washers. Qty. 5 Per Pkg.
[/TD]
[/TR]
[/TABLE]
I don't remerber the size, though. I *think* the best fit was 3/4, it was a bit tricky to keep properly centered while tightening it up.
Anyway, my oil leak is fixed and I am happy.
Had to remove the turbo to get there, plus the diagnostic headache.

...So much work to change such a simple 75cent part.