1960s Race Car Rear Suspension Question

Question

As you can see in the pictures below they dont have a double wishbone setup but instead they have this weird setup. Why did they use something like this instead of double wishbones back then and why did they stop using this type of setup afterwards? What were the pros and cons of a setup like this compared to double wishbones?

Answer 1

Many designs have been tried - all to minimise the unsprung weight and improve the response.

And the long tie bars with inboard brakes suggest that, compared to outboard brakes with 2 larger wishbones...