RTV900 Exhaust Spark Arrestor Time Frame

I have a 2010 RTV900 with the internal spark arrestor on the end of the tail pipe the is removed by undoing the two socket head screws. The early models had the screen on the end of the tail pipe and the later ones had the internal ones that were cleaned by undoing the bolt on the bottom. What was the time frame for each of the spark arrestor types?

I just took the one out on mine and I don't think it have been cleaned recently as the bolts were seized and one broke off. I got the broken...

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RTV900 Exhaust Spark Arrestor Time Frame