Et2Me2P+ was synthesized by Grignard reaction of MePCl2 with EtMgBr, followed by quaternarization using Mel. Et2Me2Sb+ was prepared by similar method, but obtained as mixture of EtnMe(4-n)Sb+(n=0, 1, 2, 3). Fortunately, (Et2Me2Sb) [Pd(dmit)(2)](2) could be obtained as single crystals in a certain condition. Both (Et2Me2P) [Pd(dmit)(2)](2) and (Et2Me2Sb)[Pd(dmit)(2)](2) are isostructural with beta'-Me(4)Z salts (Z=P, As, Sb), and indicate stronger dimerisation and enhanced two-dimensionality.