Can they be installed? Yes. There's no reason they shouldn't fit a Westy since the body panels are identical, but they are not compatible with the Westy's rock & mud guard for the LP tank. They attach via a set of brackets which are riveted to the body. That would require drilling 38 holes for attaching the brackets; the panel then bolts to those brackets. You'd then have to come up with a custom mud-flap arrangement for the LP tank because it requires protection the rocker panel moldings don't provide.
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You might consider something like the 3M Scotch-Cal kits posted elsewhere on the site.