[Wlug] Driver for SUN SBUS ethernet card.

My SUN ULTRA 1 has lost its eth0 card circuit. I have purchased a Sun 501-5443 X1049A Quad 4-Port SBus Fast Ethernet Card for my SUN ULTRA 1 running Aurora. The original fast ethernet circuitry is part of the SystemCard. I do not wish to replace the system card. Will I have a problem finding a driver? Ken Jones