I ordered the trunk insulation kit from Bird's Nest. The kit says for 58 to 60. The two large center pieces were over 2" too small, front to back. After a few phone calls and sending photos back and forth, they realized the 58, at least early 58 trunk insulation is different than the 59 and 60. Bird's Nest has contacted the supplier to revise his product and make a kit for 58's. So if your largest opening in your trunk is around 20" front to back, the kit now being supplied will not work. The longest leg of the triangle in the present kit is 18".
A big thank you to the Bird's Nest crew for helping me work through this issue.
A big thank you to the Bird's Nest crew for helping me work through this issue.