* Delete 4 Part 2739b Black Technic, Link 1 x 6 with Stoppers (match ID 2)
* Change 4 Part Black 2739a Technic, Link 1 x 6 without Stoppers {Alternate to Regular} {match ID 2 to 0}
Comments from Submitter:
(Same case as set 42021.)
This set was inventoried with Source: Parts List. I tried to find images showing 2739b in this set, but I only found 2739a. In fact, the last appearance of black 2739b I could find was in 2011 in set 8110. But even 8110 had 2739a in later copies (from November 2011). Therefore I think it is very unlikely that 2739b was included here.