Found Hasseblad 8mm 16mm extension tubes

Hi

I'm looking for Hasselblad 8mm and 16mm extension tubes in good working condition.
Main use case will be for portraits & closeups with Sonnar 150/4 lens on 500C/553ELX bodies.
Shipping to California 94010.

Thanks!

From a video on YouTube, I watched a photographer use that lens and, I believe those two extension tubes, (?) to take photographs his sons portrait.

IIRC, the most shallow tube was, I believe too small in depth of field, for average work, where as, the longer tube used, widened out that depth of field for a more pleasing rendition.

The second tube might have been a 23mm, I'm not sure, without rewatching that video.