For a 1999 Buick Lesabre: Get to both fluid lines through the right wheel well skirt. The pressure line takes a 16mm wrench. No need to remove anything else, except the reservoir cap, the pump with reservoir will lift out from the top with a bit of twisting to find the right fit. The idler pulley takes a 15mm and the pump is mounted with 13mm reached through holes in the pulley as described in the first post.