Savage Model 45 Super Sporter 250/3000 receiver aperture sight

Hello everyone,
My first post. I live in the UK and have a Savage Model 23D, 34, both in 22 Hornet as well as the above Super Sporter. My Super Sporter is missing the rear receiver aperture sight. I gather this is a Lyman Model 40s. I have looked here in the UK and can not find a replacement. The rifle is rare here, never mid the sights. What available options do I have? i.e which aperture sights are in production and will fit. I did email Lyman but they did not reply.I also have a Model 6c which is missing a magazine lifter. I found the lifter at Numrich, sadly they won't send it to the UK.
Thank you for any help.
John

Joe (Mad Dog) will be able to tell you what other sights might work, but he probably won't be back on here until sometime in early October due to his job.

Thank you Sir

Ya, a Lyman 40 is about the only way to go.

Sadly I have a Lyman 40 mount here but it's missing the slide.