Hello all, I recently bought garbage cans for the galley in my MkI and since they fit really well in the available space I thought this information could be useful to others. They are 35qt cans from Hardware Resources: https://www.hardwareresources.com/organizers/cabinet-organizers/trash-cans-lids.html
They come in different colors and have optional lids.
I got them from https://www.wayfair.com/school-furniture-and-supplies/pdp/hardware-resources-plastic-875-gallon-open-pull-outunder-counter-trash-can-hwsc1702.html but they are sold in a number of popular retailers.
1989 Tall rig #964, Seattle