Need help with sourcing refills for Vintage Ballpoint Pens

General Mechanical Pencil Discussion
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Hello All,
I need help in sourcing 3 vintage ballpoint pen refills. I am attaching a photo of the pens & its respective refills.

  1. Sailor full black BP - refill has the following info - 87-03 and 18-0104

  2. Mitsubishi Boxy BP - 83-03 and AO8

  3. Sailor Etched BP - Sheaffer Jumbo refill

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Thank you for any help/advice you can provide.

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Here are my go-to pages for information on refills:

https://www.jetpens.com/blog/The-Ultimate-Guide-to-Pen-Refills/pt/231

Assuming some of them are not standard (the first one doesn’t look like something I’ve seen before), measuring them (in particular the total length, the length of the narrow front part and the diameter of the tip) can help you find a suitable replacement.

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jetpens ??

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I already checked with Jetpens. No luck with them.

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Before buying anything, I’d carefully measure the old refill (length, diameter, tip shape) — often a modern “G2”-style ballpoint refill works even if the original is long discontinued. If that fails, some pen-hobbyists have had luck with 3rd-party adapters or trimmed-down refills to bring vintage pens back to life.

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Thank you. Appreciate all the feedback. BTW - the Mitsubishi bp pen took the Pilot BRFN-30 refill and it was a perfect fit. Thanks to Drifand for suggesting this refill.

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