Trying to figure out coordinates for long range LD regions on build 38 for flashpca

Question

[curious]

flashpca has these regions to exclude when running pca:

https://github.com/gabraham/flashpca/blob/master/exclusion_regions_hg19.txt

5 44000000 51500000 r1
6 25000000 33500000 r2
8 8000000 12000000 r3
11 45000000 57000000 r4

but they are in hg 19 coordinates, I am trying to figure out the corresponding hg 38 coordinates

I know region 2 is MHC, googling puts this at chr6:28,510,120-33,480,577

I think region 3 is chr 8 inversion region, although I am having trouble finding these coordinates

I have no idea what region 1 and 4 are.

Does anyone know what regions 1 and 4 are and what their coordinates in hg38 are? Also does anyone know chr 8 inversion region coordinates in hg38?