I have a sheet of Verlinden cobblestone, but I need to make a sidewalk with curb to go with it for a dio in Germany in 1944. Any good ideas of makers of sidewalks and curbs for this? I have seen Verlinden's offering, but am not sure how long it is. I don't need a 6 inch thing for a 10 inch walk,

TIA, and have a real good day.

Your best bet would be to cast your own. Sidewalks are usually short and expensive.

MiniArt have a selection of vacuum formed street with sidewalk sections.

You actually have several choices. which are all quite simple and allow you to do a piece the exact size you want.
1) cast a piece of hobby spackel and scribe the detail
2) if you can get your hands on sheet hardwall, remove the paper and scribe the detail
3) build up with cork pieces, and spackel in between to simulate conctrete
4) get a thin sheet of polystyrene, cover with a thin layer of putty and scribe the detail.

If you check through the articles already available on here, you should find plenty of "how to"s for each of these methods.