The aircraft wheel bays were usually painted with zinc chromate primer, which is a yellow color. They may have been painted white in the field, if they ran low on paint. Many times the paint was mixed at the air field. The paint was white and pigment bags mixed in to reproduce the color needed. If they didn't time or pigments they might have painted with straight paint. So unless you can find an account it will be difficult. Also avation gasoline, motor gasoline, and diesel fuel were used as paint thinner they can alter the color also.