bmking16 Posted August 18, 2013 Share Posted August 18, 2013 Would any of you guys know the front flare size on the rectangle air horns? I'm looking the repalce the 6" round ones I have. Also if any one has done this did you have to move the rectangle ones over? Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted August 19, 2013 Share Posted August 19, 2013 Im not sure about placement but i think the square ones are all the same size. Your mack parts guy should be able to get them if they know something. Quote Matt Link to comment Share on other sites More sharing options...
farmer52 Posted August 19, 2013 Share Posted August 19, 2013 The rectangular horns were Hadley. Their website does not list the flare size, just the length. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
alex g Posted August 19, 2013 Share Posted August 19, 2013 just went through that I wanted to change from rectangular to round but the sizes are different and would have had to drill new holes in my roof. Quote Link to comment Share on other sites More sharing options...
Superdog Posted August 19, 2013 Share Posted August 19, 2013 do yourself a favor and stay with the round ones,the chrome will eventually blister one top and before you know it,they will rust out. Quote Link to comment Share on other sites More sharing options...
bmking16 Posted August 19, 2013 Author Share Posted August 19, 2013 Thanks guys appreciate the repsonses! Quote Link to comment Share on other sites More sharing options...
MHfred Posted August 19, 2013 Share Posted August 19, 2013 I am replacing the snow covers on my MH horns so got a measurement for you. They are 8 5/8 by 4 5/8 from outside to outside. Quote Link to comment Share on other sites More sharing options...
kscarbel Posted August 19, 2013 Share Posted August 19, 2013 The round horns were Grover, the rectangular horns were Hadley. The proper way to achieve your goal would be to replace the horn assembly. Quote Link to comment Share on other sites More sharing options...
BAD DOG Posted August 20, 2013 Share Posted August 20, 2013 Hadley book I got in Louisville has round chrome aluminum ones # H00871A - 24.5" and shield kit is # H00929B #H00876A - 30" and shield kit is # H00928B. Hadley rep told me these should fit in place of your rectangular ones. I was thinking about a pair of these for mine too. Can be ordered through any place that carries Hadley stuff not sure about you US guys but I know Traction can get them for me in Canada for about the same price as the rectangular ones. Quote Link to comment Share on other sites More sharing options...
bmking16 Posted August 20, 2013 Author Share Posted August 20, 2013 Thanks again you guys the measurements and part numbers will help!! I'm still deciding what to do. I currently have the round ones and I think they were orginal to the truck (they are Grover ones) Quote Link to comment Share on other sites More sharing options...
Hope Adams Posted November 25, 2013 Share Posted November 25, 2013 The rectangular horns are hadley, its website doesnot show its flare size, however its lenght is available on site. Quote Link to comment Share on other sites More sharing options...
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