How do you change the alternator on a 1995 Chevy Astro?

Two bolts on front of alternator are easy to get to, bolt on back is hard. Unbolt the tranmission and engine dipstick tubes from each other up top. Jack up and remove right front tire. Seperate engine dipstick at side of cylinder head. Bolt is a 10mm head that can be got to inside of wheel well.