Where can I get some for holding interior parts.
Must be very aggressive and not the wimpy West Marine/Boat US stuff.

They make a plastic velcro now. It is STRONG stuff. Look for it at West Marine, Boater's World, and maybe even Home Depot. I think it only comes in strips, but it can hold GPS, radio, etc, etc. It is kind of a clear/white color, and comes in a blister pack.

Walmart has also started handling it in their crafts or sewing departments...... It is available from 1/2" to 2 or 3" in in width & sew on or glue on types. .

There are even different types of velcro. The hook and loop type is the most common one. However there is also a mushroom type that is supposed to be incredibly strong. Maybe you can find some more info and suppliers on the 3-M web site.

3M Marine Velcro. Very good stuff!

bought some at lowes, used it ti hold down front of cushions on engine hatch, works great. it was called industrial grade velcro it came in a 15 ft roll about an inch or so wide, and cost was 24.95
dave