I saw that bike Mario but from memory a bit over priced and I think it got passed in. You'll notice he has a UFO front guard on his recreation, an indication the front guards are not easy to come by. In saying that I just had a look an alpha-sport and they are available and in yellow (about $175au posted). The ones supplied here from Suzuki Aust. or SuziParts are painted that damned poxy silver.
I been thinking about your friends bike too 43, don't want to cause a stir but it seems improbable the front guard fitted is standard when that flared style of guard didn't appear on suzuki's until 1984 (3 models later) The '84 RM yellow is ever so slightly brighter and not quite the same as the earlier jobs, not overly apparent until one takes the time to look. There should also be a small 'Made in Japan' and the part number will be embossed just below this on the inside about an inch up from the bottom, the number should tell the story