Just had a few thoughts.
1, to install the cols you need to replace the cols in the gta3.img but there are duplicate cols in the data files so you should try your ones in the data files, if they're the new ones then find someone that's installed the latest ones and get them to send you their data files.
so that's that but..
2, arKy used the original LC col files so if you can get in contact with him then he might still have LC installed and be able to send them to you.