I highly recommend just buying 25mm pins, they are cheaper now than they use to be:
https://amzn.to/4dnbXdo
In this video I find a cheaper alternative to the expensive Chinese 25mm x 160mm bolts that fit into most Chinese mini excavator attachments. I found these grade 8, 1-inch diameter bolts at Menards. They have 6in and 8in available and both work. The bolt heads are big and don't fit into the grooves on the attachments so two tools have to be used to tighten the bolts. It's about $12 for a pair of bolts and nuts. Works with quick coupler only. Thanks for watching!