Technical Stupid SBC header question question

I have a set of block hugger headers on my SBC in my 26T. I need to replace them, but dont remember what brand they are. What do you think my chances are, if I replace them the flanges will close enough for a bolt up replacement????????

Thanks
Bill

 

^^^^^^
Collector position ,3 hole flange ????
If So ,In my experience found a few different times the collator not alway clocked in same spot by same manufacture,

 

Even if you did find the same brand. Anything like headers there is always a degree of fitment or modification you have to overcome.