We maintain an inventory of over 2,000 different types of gas springs.  We have millions in stock.  However, sometimes we won’t have a specific force and will have to substitute a close one.  Typically, a 30 pound spring will work in most 20 pound applications.  Please try it.  If it will not work for you, we can work on a return. Please note our lead times from our manufacturer are long, it could be up to 6 months before we will have more stock on the part you ordered.