Desponge had already messaged me to track down this timing rod etc.. and I'm out of a lot of small cocker parts. Most of my spares have gone into recent builds. The short grub screws are a bit of a pain to track down. I think they are stock 6-32 unc thread, but it's the super short length that's the problem. I normally pick up a lot of my bits on Stateside forums, but the cost of shipping in has got silly now. You could try giving Belsales a call
If that lapco timing rod was purchased new it should have come supplied with the grub screws