In the late 50s and early 60s, Gibson used .022 400v Sprague capacitors in their guitars. Today, those original .022 caps are collectable and expensive. But we have discovered that caps originally rated at other values can drift over a number of years. Some of them drift right into spec range for an .022 capacitor. Since they're not being sought to restore an old Burst, they're more affordable, but they sound exactly the same.
The capacitors used in these harnesses are original, vintage Sprague Bumblebees and Black Beauties that have drifted from their original values and now test at .022 +/- 20%, making them the ideal upgrade for your Les Paul Standard, Traditional, Classic, etc.