Because I see no reason to release them separately.
Still no idea where this goes: https://steamcommunity.com/tradeoffer/new/?partner=57254641&token=y9gVpeLQ

NB! Since I despise the default grenade texture with a passion, I used HappyHead's HD Grenades as a base. So most, if not all the credit goes to him. You can find the original mod here: https://modworkshop.net/mydownloads.php?action=view_down&did=12492