Push rods / lifters

My model t has been on the road for about seven years since a complete engine rebuild and I’m very satisfied. when I built it, I used the three wrench lifters. The locking type sounded better to me, but now I am thinking about checking the clearance and wishing I would have used the self-locking type. My question is, are the self-locking screws available separately and will they work in the lifter I currently have now? Thanks. Ken

I think there are no interchangeable parts between the two types. You are stuck with what you have.