Where can I find body plugs???

I need a couple 1" , 1-1/2" and (1) 2-1/2" body plug for my 68 Barracuda. The local body shop supply place only sells boxes of 25. The other local "auto parts" places laughed when I asked.(guess they sell a lot of pine tree air fresheners and gum) LOL
Anyone know where I might find them?