Not sure how dimensionally different the Starlight is from the Pelican 1750, if I remember correctly my 50cal is in a Starlight and it's slightly bigger than a 1750. I know Cheaper than Dirt has pissed off alot of people on this forum, but I"ve bought replacement foam sets from them for the 1750s for I want to say $65 a set or so.
I got ahold of a bunch of 1750 cases without foam and talked to Foam Factory and even got foam samples from them. They were awesome to deal with, but I just didn't feel like going through the hassle of custom ordering all the different thicknesses and materials.