Erikson's on Clark Street is still open, it's right across the street from the old Wikstrom location. They have homemade potato sausage, meatballs, frozen lingon berries and lutefisk etc. Just allow ample time, they have been busier than usual (with the holidays and Wikstrom's being closed) and the owner has a crew of temporary workers who are sort of learning on the fly. I do not think they have limpa bread, you should duck into Svea a few doors down and ask them where they get theirs.
btw, the ladies at the Swedish Museum tell me the reason Ingvar and his daughter have not reopened Wikstrom's is they are facing plumbing issues in the space they moved into and that's causing huge permit headaches and so now they have to decide if they update the plumbing in that location or try and find a different one all together . . .
good luck (and God Jul!)
bjt
"eating is an agricultural act" wendell berry