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I certainly can't help you without a better picture of the horn. The first picture doesn't show at all and the second picture has the horns barely visible.
Overland got out of the parts business last year but you can still find shops
that have the parts in stock. Best bet would be to place a want add on HOyardsale or call some shops that might have the part. I am sure with some digging you will find what you need.
Actually that is the Overland horn with their stock number. If you look at the pic on their site the horn is standing on its mounting pin and is crooked so it looks odd but that is the horn you want.
- Grille : I have 3 option i think, #1 try to fit Detail Associate 2711, #2 Smokey valley 138 but it have no picture, i don't know if it's really the good design and if the 4 grille are include or #3 try to have them by kaslo.
What do you think about this option ?
- Exhaust stack : Detail associate 2402 but it's not exactly the same.... other option ?