Solid bushings vs. rubber vs. poly

bOb shingler said
you're drag racing so consider nothing but aluminum, period.

which ones would you recomend Bob?

was looking at these.. I figured they'd work and I could copy them on the lathe in aluminum.

http://www.summitracing.com/parts/ptp-4-1001-bl/overview/

One thing about the aluminum ones I see is they say 2" which the spring is wider than that also there is no collar so it would seem side to side motion would be an issue.

Can you link me ot the ones you recomend?