Biobank HLA *IMP:02 imputation labels ( A_4027 ? A_4386 ? B_7020 ?)

Question

[Jak]

I'm trying to parse the HLA imputation data from UK BioBank data and it lists the allele label headers here

https://biobank.ctsu.ox.ac.uk/crystal/refer.cgi?id=2182

I assumed the format meant that allele A_102 would translate to the old nomenclature A*0102 and then to the current nomenclature of A*01:02. This seems to work for the majority of alleles, however not all.

Does anyone know what format these allele labels are in and where I could find a conversion table to the current WHO nomenclature.

I don't seem to be able to find these allele labels in particular:

A_4027, A_4386, B_7020