rockford amp transistors

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im working on a rocford fosgate amp and the transistors are irf6215 and irf 3415 wondering if theeses will work instead i have a lot of irf 540 and irf 3205's in stock wondering if theese might work in place of the old ones and if so what does the 6215 cross to a 540 or 3205 and the 3415 cross to a 3205 or 540 please help
 
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