casters/wheels for my ampeg?????
 

I have an Ampeg classic series 4x10.It has the steel holders/inserts,whatever,but no wheels,I see a bunch of different sites around includeing thebay,are they all universal,the wheels?what size there are hundreds to choose from,figure this would be an easy one for ya'll,this thing is breaking my back,but I sooo dig the sound Im getting outta this beast im not looking to go smaller just yet,gigs will be coming weekly in the spring,thanks in advance:bassist: