Genuine Ariens Gravely KIT 13 SEMI-PNEUMATIC TIRE Part Number 79703400Comonly used on Models. 991158 (095000 – 099999) Zenith 60. 991158 (100000 – 119999) Zenith 60. 991159 (095000 – 099999) Apex 52. 991159 (100000 – 119999) Apex 52. 991161 (095000 +) Apex 48. 991163 (095000 – 099999) Apex 60. 991163 (100000 – 119000) Apex 60..