\documentclass{article} 
\usepackage[english]{babel}
\usepackage[bookmarks=false]{hyperref}
\usepackage{pdflscape}
\usepackage{xcolor}
\usepackage{longtable}
\usepackage[T1]{fontenc}
\hypersetup{
    colorlinks,
    linkcolor={red!50!black},
    citecolor={blue!50!black},
    urlcolor={blue!80!black}
}
\usepackage[letterpaper, landscape, left=1.3cm, right=1.3cm, top=2cm, bottom=2.5cm]{geometry}

\begin{document}

\input{bompre.dat}

\begin{center}
    \begin{longtable}{| p{3.8cm} | p{4.7cm} | l | l | l | l | r | r | r |}
    \hline
	\multicolumn{1}{|l|}{\textbf{Reference}} & \multicolumn{1}{|l|}{\textbf{Spec}} & \multicolumn{1}{l|}{\textbf{Part No.}} & \multicolumn{1}{l|}{\textbf{Supplier}} & \multicolumn{1}{l|}{\textbf{SKU}} & \multicolumn{1}{r|}{\textbf{Price}} & \multicolumn{1}{r|}{\textbf{Qty}} & \multicolumn{1}{r|}{\textbf{Total}} \\ \hline	 
	\endhead
	\input{bom.dat}
    \end{longtable}
\end{center}

\input{bompost.dat}

\end{document}