monitor 4.6 cap

So I was looking to upgrade my set of my monitor 4.6's and see that its a 13.5uf cap. If you have upgraded yours, could you please help me decide what to use. should I go with a 13uf or 15uf or 2 6.8? and how did you mount them? I was also looking to replace my sl2500 and found a set of monitor 4.6 on CL that already had the rd0198 installed for $75 so I pick them up.
M7's 1982 Peerless tweeters
M5's X2 (1981 Peerless tweeters, 1988 with upgraded tweeters)
M4's X2 both with Peerless tweeters
M5Jr with SL1500 (in the garage, they sound great)
M4.6 series2 X2 with upgraded tweeters
SDA 2 with upgraded tweeters

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