Adaptor 1 inch compression (with 2 or 3 screws) to 1 inch horn with 1" 3/
Eminence BS2 Bolt-On Driver to Screw-On Horn Adapter B2S ADAPTOR
Eminence 1.4" Aluminum Adapter to Pair a Bolt- HA14-2 B&H Photo
PC-5038 Horn Adapter
P Audio PC-50 Adapter For 1 3/8" Screw-On Driver To A 2" Horn
Impco A2-7 Air Horn Adapter - Carb & Turbo
Eminence B2S-A Aluminum 2/3-Bolt to 1-3/8"-18 TPI Screw-On Horn Adapter
Bolt On Adapter for 1.5" or 1.4" Driver to 2" Horn or Vice Versa : Electronics
Arnolds & Sons Practice Adapter French horn – Thomann United States
Horn Adapter Wiring (pair) - 0S03 - College Hills Honda
DENALI Wiring Adapter Connects SoundBomb Horns to OEM BMW Harness - Twisted Throttle
Amazon.com: FARBIN Car Horn Special Plug Compatible with Old BMW Adapter Wiring Harness Pigtail Socket Car Horn Connector Harnesses Cable 2Pcs : Electronics
Eminence ES2BA Screw-On Driver To Bolt-On Horn Adapter at Gear4music
PC-90 Horn Adapter
Horn Button Adapter Ring for Momo Steering Wheels | In Stock, DriftShop.com