Limited-time deal: Rite in the Rain Weatherproof CORDURA Fabric Notebook Cover, 5 1/2" x 8 1/2", MultiCam Cover (No. C980M) https://www.amazon.com/dp/B00KWPWKBK/ref=cm_sw_r_apan_glt_i_dl_B6EW8ZKTMFDV4ZG3J92E

Looks like it's the right size for those green notebooks. I have quite a few rite in the rain notebooks/covers, never tried to swap in one of those green ones though.