Thanks, MT
Did they have different part numbers for the different mounting brackets (and, maybe for Hi/Lo)?
The car horn mounts are completely different from the truck mounts so, I am sure there are different part #'s for them.
Both of my NOS horn kits have identical horn mounting brackets in them & there are no part #'s on them.
The earlier truck kit is GM part # 986099 Gp.# 2.810
The later truck kit is GM part # 986397 Gp.# 2.810
My book shows 986099 as 1947 -1950.
My book also shows 986397 as 1951 & 1952 only.
Interestingly.... the 1953 & 1954 accessory installation books shows no listing for a truck accessory dual horn kit.
Looks like the firewall mounted seashell design horns in the dual horn kit were only offered as an accessory from 1947-1952.
Tim.... can you look up the RPO's for 1953 & 1954 to see if the dual horn kit was an option for 1953 & 1954 ?
It will be interested to see what kind of additional info. that Brad can dig up on this topic.