These appear to be copies of the Clark Headers that were made in the l950's.
This company sells 'top notch' products.
Good luck, John M., #3370
I have been running them for about a year now. They are great for the price. If you have a manual tranny you will have to modify the rear collector because it comes out about 2in from the z bar bracket.
I am not quite sure I understand the rear collector modification issue. I did order a pair, it will probably make sense when I see them on. Many Thanks
They are only close on some vehicles.
You may only need to worry on the 'later' models as the column shift mechanism is close to the engine etc.
Good luck, John M....
Mine was close to the bracket that has two bolts into the block that the clutch z bar pivots on. The rear 2 into 1 collector is straight down towards this bracket.