Eibach makes a Vigor specific lowering kit, though it's a very mild drop.

From what I've read as well as personal research, I'm 99% sure any springs for '90-97 non-V6 Accords will work as well. With the exception of the front sway bar and struts, the Accord and Vig share the same suspension. Just remember that the Vigor weighs a couple hundred pounds more, so it will probably lower the car an extra .25" or so if you use springs designed for an Accord.