Semiconductor structures with different devices each having spacers of equal thickness and methods of manufacture are disclosed. The method includes forming a first gate stack and a second gate stack. The method further includes forming sidewall spacers of equal thickness for both the first gate stack and the second gate stack by depositing a liner material over spacer material on sidewalls of the first gate stack and the second gate stack and within a space formed between the spacer material and source and drain regions of the first gate stack.