(1) Horn style design，have a more personalized rearview mirror decoration. 1 Pair Horn Style Mirror Cap (Part Number:FR3Z-17682). Clean the location of the installation with rubbing alcohol before proceeding.
eBay
(1) Horn style design，have a more personalized rearview mirror decoration. 1 Pair Horn Style Mirror Cap (Part Number:FR3Z-17682). Clean the location of the installation with rubbing alcohol before proceeding.
eBay
(Pair Glossy Black Horn Style Side Door Rearview Mirror Cover Cap Trim Fit for Ford Mustang 2015-2021. Compatible With: fit for Ford Mustang 2015-2021. Install: Stick on with adhesive tape. 2) Pill the back of double-sided tape.
eBay
(1) Horn style design，have a more personalized rearview mirror decoration. 1 Pair Horn Style Mirror Cap (Part Number:FR3Z-17682). Clean the location of the installation with rubbing alcohol before proceeding.
eBay
Fitment: As listing show * Specifications: Condition: 100% Brand New Size: As The Picture Is Shown Color: As picture show Material: High-quality ABS Plastic Package Include: As picture show Installation Guide: Step 1: Please clean the place and make sure that there is no dust. Step 2: Remove the adhesive in the back; Step 3: Heat the glue with heat gun or hair dryer; Step 4: Install the products in the right place. Do not wash your car within 48 hours. Note: Please do not wipe the surface with alcohol.Alcohol can corrode the back glue and cause the product does not to stick. Notice: If have any questions please contact us, thanks!.
eBay
Am not sure what era this Mustang steering wheel cap is from? Maybe 90s The cap has a horn function , but this has not been tested . I can't say the horn connections work . The condition of the cap is in very good condition . I have placed it as used because I don't know if it was, but it looks like it hasn't been used. The two metal connectors on the rear are in very good condition . 
eBay
Notice: Just decoration, only fits models with original steering wheel shifter paddle. Fit For Ford Mustang 2015-2023. Materials: High Quality aluminium alloy. We will reply with 24hr.
eBay
(1) Horn style design，have a more personalized rearview mirror decoration. 1 Pair Horn Style Mirror Cap (Part Number:FR3Z-17682). Clean the location of the installation with rubbing alcohol before proceeding.
eBay