be found here: 
Stable Diffusion V1: CampVis/stable-diffusion
Stable Diffusion v2: Stability-AI/stablediffusion
Available Checkpoints are:
stable-diffusion-v1-4 (512x512 resolution) CompVis/stable-diffusion-v1-4
stable-diffusion-v1-5 (512x512 resolution) runwayml/stable-diffusion-v1-5
stable-diffusion-2-base (512x512 resolution): stabilityai/stable-diffusion-2-base
stable-diffusion-2 (768x768 resolution): stabilityai/stable-diffusion-2
stable-d