When I upgraded to the 6:1, I found that the bottom block wouldn't fit in the traveler and I had to add the shackle......Do I need to upgrade my traveler?

I'd really be happy with some of these, if I could find them anywhere. I could buy the standard "D shackles" ....... was hoping to just find the cheap stamped ones and buy a couple spares.

The problem is that I haven't been able to find them. Oh well. I guess I'll just order some of the standard D-Shackles. What's $16 for a couple.