Alternate No. 1 Itemized bid for the purchase,delivery and installation of new upholstery and supporting foam to restore the auditorium seating to a like-new condition, improve visitor comfort, and ensure durability within the unique planetarium environment. This renovation project consist of 260 Erwin model# 51B.12S stadium seats. The proposed replacement materials must be of a commercial grade, durable enough to accommodate an estimated 150,000 guest annually with a life expectancy of at least 10 years from date of installation. Alternate No. 2 Itemized bid for the purchase,delivery and installation of 260 new updated seating units that can accommodatean estimated 150,000 guest annually. The construction of the seating and the fabric covering must be durable with a life expectancy of at least 10 years from date of installation. This renovation project consist of 260 Erwin model# 51B.12S stadium seats.