And where the hell would I get one of those?

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Madmax's ebay link is what I was thinking about. I've seen them with at least 4 slots. Last time I googled (< 1 year ago) I found a few options. Now I'm coming up with nothing. Maybe I'm not using the right keywords. I know I've heard them called a simm tree and simm saver. That's all the help I can offer.