Check summitracing.com.http://store.summitracing.com/default.asp?Ntt=totalseal+compressor&x=0&y=0&searchinresults=false&Ntk=KeywordSearch&DDS=1&N=115&target=egnsearch.aspPart number gives the size of the compressor, TSR-RC3400-3500 is the one appropriate for our engine. (3.444")