Part # 884003B has been discontinued and replaced by the 883003 handle bracket, so older 88TTE flat box handles will need to upgrade to the new handle bracket parts, which are now the same parts on the XHTT universal extendable handles.
TapeTech® Handle Bracket W/ Bushing
The TapeTech® Handle Bracket W/ Bushing (884003) has been discontinued, and is no longer available.
Consider the following product(s) in it's place: