have a 1.7.10 modded server and would love to have the seige weapons on it can you help?

1.7.10 didn't have siege weapons and isn't going to get them. If you want to play with these you need to update to 1.12 and you really should as 1.7.10 is a very very old version by now and at this point there's probably even more content in terms of mods in 1.12 and mods are starting to port over to 1.14+