DSM injectors with true o-ring manifold seal

[rossman]

I purchase as set of Precision made DSM 3000GT injectors. The "o-ring" that fits between the tip of the injector and the intake manifold is too big. I was contemplating using standard torus shaped o-rings (circular cross section) instead of the stock rectangular toroid o-ring. My concern is that it won't seal properly in the stock intake manifold hole. I am also worried that my Pallnet style fuel rail won't have enough clamping force to compress the stock o-ring. Has anybody had luck getting a good seal with a standard o-ring?