The seals indy uses the hard white ones are terrible for tearing and leaking like heck.

Used to start my car it looked like Puff the magic dragon put a viton seal on and nice!

I think it's these I use.
http://www.summitracing.com/parts/slp-st-2125/overview/

http://www.summitracing.com/search/brand/sealed-power?keyword=viton%20valve%20seals