Which Metal Spring Clamps Best for Headliner Installation?

i was quoted 800 dollars to install a headliner. so i bought one off of ebay for 69 dollars free shipping. i screwed the first one up so i bought another for 69 and got it installed right the second time.

turns out you can buy many headliners at 69 bucks a pop before you get even close to the 800 i was quoted for an install