I get whatever exterior paint is on the mis-tint discount shelf at lowes.
Long as it’s a darker color - tan, brown, green, red….
Oil based is better. I’ll get one of those cheap paint kits. Use the rollers and pan and throw it all away when done.
I have asked the folks behind the counter at Lowe's to darken the tint on mix match paint and it works great. I'll go back with a branch and different color of spray paint to blend it in better.