head id

i was told these where brad 5's but the stand supports between the stand bolts isn't on my other 5's.does anybody know?

http://4.bp.blogspot.com/_OMfo1HPucnY/S3w6dwxurpI/AAAAAAAAATw/EJkG2DFAggw/s1600-h/bae5home+%286%29.jpg

 

they are 4s

 

I think Wayne's hit the nail on the head - they look like the 4's we used to run

 

I have a set that look like that . I was also told they were 4's. The exhuast port were different from 4's to 5's from what I was told ?