Question 1

Will this fit Janome 2212?

Accepted Answer

So these are standard class 15 bobbin cases. They measure about 22.75mm across. The majority of front-loading machines can take this case, a few won't. It's hard to tell whether or not yours can fit it because the difference is 1-3 mm, which is tiny.
Most accurate way I've found to test: measure your actual bobbin size. It should be 20.3mm across and 11.7mm wide. If it's smaller than that, it's not a model 15 so these will not work.
Hope that helps.

Question 2

Will this fit a singer heavy duty 4423?

Accepted Answer

So these are standard class 15 bobbin cases. They measure about 22.75mm across. The majority of front-loading machines can take this case, a few won't. It's hard to tell whether or not yours can fit it because the difference is 1-3 mm, which is tiny.
Most accurate way I've found to test: measure your actual bobbin size. It should be 20.3mm across and 11.7mm wide. If it's smaller than that, it's not a model 15 so these will not work.
Hope that helps.

Question 3

Can it be used for kenmore model 1813?

Accepted Answer

So these are standard class 15 bobbin cases. They measure about 22.75mm across. The majority of front-loading machines can take this case, a few won't. It's hard to tell whether or not yours can fit it because the difference is 1-3 mm, which is tiny.
Most accurate way I've found to test: measure your actual bobbin size. It should be 20.3mm across and 11.7mm wide. If it's smaller than that, it's not a model 15 so these will not work. 
Hope that helps.

Question 4

will this fit my Sears Kenmore 158.13180?”

Accepted Answer

Probably

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Sewing Machine Bobbin Case, Stainless Steel, Front Loading Class 15

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