Is it Possible to create Custom Lengths of Fasteners in the toolbox?

We have some unusual length fasteners that have been custom made by our fastener supplier. for example in the AS standard, M12 x 75mm long, which are not present in the standards on the toolbox. Is it possible to add custom length fasteners into the toolbox? I know it's not ideal to have lengths outside the norms, but we have a large amount of historical designs that I have to deal with.

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