All O-rings are rated for oil. You can get things of that shape that are not O-rings, but you won't find them in kits. If the one you used fits properly, you should be good to go, but if it didn't fit it might just leak a bit without actually stopping the music.
You should be able to find Victa ones at the on-line store on this site. I don't know if they are standard size O-rings or not. If they are, the one from your kit may be the right size.
