1974 Sportster Project Part 3 parts that don't fit?

This is a series on my 1974 Sportster XLH that I recently bought at an estate sale for $1800.
The Bike was put in a garage back in 1999 and sat in the corner until January 2022 when I bought it. Tires were flat, brakes were locked up and every drop of fluid that was in the bike was now a sticky puddle of goo beneath it. Question; How long does it take an AMF Harley at two drips a day to lose every drop of fluid in it, (Brake, oil, transmission, primary, etc.) Answer; 23 years. Come along and we’ll see if we can’t get this thing back on the road.