Dovetails...can I buy these off the shelf?

For my shoptask 3-n-1, I need to fix the very poor design of the
swinging millhead unit. I'm not too keen on thier newest design
option using the 4 posts (quadralift) to move the millhead up and
down. I've tried to find off the shelf dovetails with no luck. It
seems everyone sells linear rails but not a dovetail rail in the size
I'd feel comfortable with.


Thanks