Delete the "not available" tag in Varients menu

Hey, I have a problem, I sell standard parts, screws, etc. Now we have a product that has a length and a diameter. However, some products are only available in certain lengths with corresponding diameters. Example: Ejector pin: diameter 0.4mm and length 100mm. Of course these are not all options but for exactly 0.4mm diameter it is only produced in 100mm length. Now I have deleted all lengths except 100mm for exactly this variant, but it shows me in the store that all other variants (that I had deleted) are not available.

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