The HLA important in IDDM is -.
95% of IDDM (Type I Diabetes Mellitus) patients express either HLA DR3 or HLA DR4 or the heterozygous DR3 / DR4 configuration. 
No HLA association is seen with Type II Diabetes mellitus or NIDDM.
HLA-A3
HLA-B27
HLA-DR3/DR4
HLA-W1