Looking for Olivetti , Panasonic, or Silver Reed compatible correctable ribbons? The 4 listed here  for sale are for typewriters:

Olivetti ET101/121/201

Panasonic KX-E2000/4000

Silver Reed EX50, EXP5000

These replace correctable ribbons:

Olivetti 784204, 782224, 7844824

Panasonic SKX-ECK

Silver Reed 5501,6601

Uses lift off tape R1422

Olivetti 7289816

These ribbons are all new because the "remove before use" bar is still attached. One of the ribbons has a slight imperfection which should not affect its usage.