I would like to obtain the exact coordinates of the ERA5 wave HRES native grid and unfortunately I cannot get a hold of them.

ERA5 documentation states a resolution of 0.36 degrees for the ERA wave HRES, in a reduced latitude/longitude grid - however I cannot see to find a reduced Gaussian grid providing this exact spacing. 

In the FAQ: Frequently Asked Questions, under the Q. How do I know the grid from from the 'T' number? question, there is the below list of reduced Gaussian grids and their equivalent spacing between grid nodes :

From the list above there is no grid providing an exact 0.36 degree spacing. The closest value is 0.351deg and that would correspond to the N256 grid.

Is the ERA5 HRES wave grid using the N256 reduced Gaussian grid? If not, what grid is it exactly using? A custom one?

For the atmospheric HRES ERA5 values is quite clear the N320 is used...

Thanks in advance!