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Here is a combo pack of my variant impulse engine and one of the impulse crystal designs I came up with. This one will require a lil extra trimming/sanding to make it fit, but I left it a little long to give you the option on how you would like it to fit.
This is for the Polar Lights 1/1000 TOS USS Enterprise, but I am sure you could make it work one another kit with some modification.
Note: the 2 parts are connected by thin sprues which need to be trimmed. If I didn't add the spruse, shapeways counts it as multiple items and doubles the price.