head differences

how can u tell the differences between a d16y8(ex) head and a d16y5(hx) head just by looking at it. can someone help me?

the y8 will have a vtec solenoid at the top left corner and the y5 wont

i have a ex head and i want to make shure it is a ex but the hx and ex both haves vtec and both solinoid is in the same spot. Is it?

one has roller rockers one don't.y8 don't have it