SIGNATURES Dated: March 18, 2019 PLATINUM EQUITY INVESTCO, L.P. By: Platinum Equity Investment Holdings IC (Cayman), LLC, its general partner By: /s/ Justin Maroldi ----------------------------------- Name: Justin Maroldi Title: Assistant Secretary PLATINUM EQUITY INVESTMENT HOLDINGS IC (CAYMAN), LLC By: /s/ Justin Maroldi ----------------------------------- Name: Justin Maroldi Title: Assistant Secretary PLATINUM EQUITY INVESTMENT HOLDINGS, LLC By: /s/ Justin Maroldi ----------------------------------- Name: Justin Maroldi Title: Assistant Secretary [Signature Page to Form 3]