Is National brand rear main crankshaft seal an acceptable brand to use on a 2001 S40?

 

National Oil Seals is a US after markets brand from Timken (ie the "bearing" people). I'm sure its of good quality but I'd be more worried about fit and getting the correct part considering if it leaks or walks after you put the transmission back in, you have a major effort to replace. Personally I would probably go genuine Volvo or a known OEM supplier to Volvo. Tascaparts.com sells the genuine Volvo part for $24...

https://www.tascaparts.com/oem-parts...w0LWdhcw%3D%3D