Much obliged my friend. FS 13538 equates to Chrome Yellow, 5-2 looks a slighter less shade. I have a tin of Humbrol 188. According to Urbans, FS 33538 is a close match to RLM 04 which I have a few different acrylic brands. Also looking at mixing Tamiya yellow with either orange or red. Plus there is the possibility of ordering Gunze or some other acrylic brand online but I'm usually faceing a very steep shipping price