Need help with gear oil selection

I just rebuilt my 4 speed and need some gear oil for it. The oil in the picture is what Brewers performance sells for mopar 4 speeds. Anyone seen an oil with the same gl-4 rating at their local autoparts store. I would like to buy it locally if possible. It does not have to be the same brand as this. The ones I have seen online at the local parts is either Gl-5 or Gl-4/Gl-5.

GL4SL ONE GALLON STA-LUBE 85W-90 WEIGHT GEAR OIL
One gallon jug of Sta-Lube 85W-90 gear oil, GL4 specification (with no friction modifiers) as recommended by Mopar. Services all A833 4-speeds with a little to spare.
GL4SL ONE GALLON STA-LUBE 85W-90 WEIGHT GEA