28Eliminator

I need to cut a hole under my seat to through bolt my bolster to the floor. I was thinking about trying to match the red carpet, but haven't been able to find any red deck plates. If I can't find it I guess I will just install a white one. I think a 4" one should be big enough to get to all the bolts, but is there any advantage or disadvantage to the twist and pull compared to the screw in type.
Thanks for any help!