I put the one piece ABS headliner in my truck 7 years ago. I like the look without the bow in the middle. It was a real PITA to install, with a lot of cutting, just a little at a time. Got mine from Classic Parts.
Definitely a 2 man job and a third would be useful at times. One inside and one standing outside each door opening.
Still looks like it did the day I put it in.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.