A search locates several comments about child safety seats, for example
AndyDodge, 1940 Dodge
but thought I'd start a discussion for those who have made provisions for this, to show how they set it up.
This just occurred to me today, because our 18 month old grandson is with is for a few days, and I discovered that our (un-mentionable off-topic 2019 Honda CR-V) that we purchased several months back apparently doesn't have the latch points that I thought were standard on all modern cars.
So now I'm thinking that I will see if I can install something like that in my 4-door P15.