I have a '78 Cutlass.. I can find the speed bleeders for the front calipers fairly easily..

But not for the rear wheel cylinders.. Does anyone know the thread of those bleeders? Summit is saying 10mm x 1.5mm thread, 30mm overall length.
Does this sound right? These are Russell p/n 639580

Fronts I am finding at 3/8in. - 24.. 1" overall..

Are these the correct fittings?

thanks