Oof, yeah $14 each is expensive! They should be less than 1/2 that. Would the rubber ones leak? They might if they aren't allowed to sit at their natural angle. A lot of times when people have annoying slow leaks in their tires, it's the rubber valve stems (a problem I've never had in 10 years of metal stems on 3 sets of wheels). Should be easy enough to drill a hole in the cover so that the stem isn't bent unnaturally.
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