The orange spring on this page. https://www.sprinco.com/tactical.html
And the buffer weight on this page. https://www.armorydynamics.com/KAK-LR-308-Carbine-53-Ounce-Heavy-Buffer_p_367.html
Those look like exactly what you mentioned. How were you able to find out my rifle is 7" tube? Did you find the info or you just know by looking at it? I am not very knowledgeable of the specifics yet but I'm learning!