I have Momo 5spd shift knobs for $68.00 each shipped. Yes they have a groove at the bottom so it will hold the shift boot and no set screws to deal with. This shift know matches the steering wheel. These can be ordered from my website.
www.subaruxtras.com
Please put nasioc in the note field to recieve this pricing.
Mike
Update I have them back in stock order away