3/8" side mounted 1980's "grant" brand drawer slides

Hi there.

Updating a very well built mid century desk and hope to replace all the ball bearing slides. Photos are os the smaller drawers just to see if you can help.

The larger ones (not shown) all say Grant. I know they are from the 70's-80's era.

The desk was built around only having limited space for the slaides on each side so need 3/8" side mount.

I am well versed in Blum hardware but need help on these.
Thank you for your input.

James.