I realize this is an old post, but I just installed a conversion kit. It is a two speed electric motor that replaces the vacuum unit. The switch has been modified to fit the dash and use the stock knob. No perm modifications in case you want to go back to stock. Got mine for about $180 from Concours Parts. Very tricky to put in because the space is so limited. Couldn't have done it if I didn't have the console and glove box out already. The wire diagram was not included in mine, but easily solved with a quick call to vendor. Vendor lady was very nice and apologetic. Very pleased so far.
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