Shucks, and here I am thinking 2.3 is regular res. All my 510's are right around 2.2-2.4 that I have now and the LR are the cisco 1.5-1.7. I will stick with my order but if the RES is at or around 3.0 I'll have to Cut the order to 5. Odd, because ALL the Tankomizers, standard 510's, 303's, and...