-178 -183 ?

I just online updated my SLSE8 for AMD64 to 2.4.21-178-smp, however, in directory /usr/src, there is linux-2.4.21-183 and linux-2.4.21-183-include, but no linux-2.4.21-178. It is confusing. is there anything wrong? I am trying to re-install gm-2.0.8_Linux (from Myrinet) after the updating the kernel, but some include files are missing. Any suggestion? Best regards Jyh-Shyong Ho, Ph.D. Research Scientist National Center for High-Performance Computing Hsinchu, Taiwan, ROC