Actually, in this case a petroleum product of some type would be preferred. Even though the sled is stainless, KY being water-based wouldn't be a good mix (stainless can still corrode )

You could also use a heavy rubber mallet and a shoehorn.

I can also tell you that the Acura Integra's dual-DIN stereo hole isn't exactly double-DIN size (again, the mounting collar issue with aftermarket heads).

Bruno