This extension is made to lengthen out a half pint arch so a second pan can be added. This extension is 33″ long and will double the length of your 1/2 pint evaporator. You would need to take the back panel off of your half pint and then this kit bolts on. Still uses a 6″ stack. Second pan and additional brick sold separate. Either a 1/2 pint pan or a supreme pan will work with this kit.