The Krink parts kits that are currently in stock do include rivets.
The stock tang uses for the side folder uses 1 long rivet and 2 short rivets per side. The trunnion only uses 2 rivets per side on the Krinkov. That's 9 rivets. There would be a 10th rivet needed if you didn't have a center support installed in your receiver (i.e. bent-metal blank or flat). Since you're using an OOW receiver, the center support is already installed.
K-Vars ad for the Krink 5.45 Krink states that it does not include the triggerguard or triggerguard rivets. You can order their "receiver kit" which includes a triggerguard, rivets, selector stop, mag release, mag release pin, and mag release spring.