A 4.7uF cap is still within 6% of your required value of 5uF, so that should be OK. But, if you're anal like me, and want the correct 5uF, Jeff sells an Audiocap, a Dynamicap and a Sonicap in the 5uF value too. And since the 5uF is a parallel cap, you could use something other the Mundorf Supreme, and try one of these alternates.
Good luck.