Need to know stat...m-body 8 1/4

wow!!wait a sec..right now i have teh 7 1/4...so it would be less than 1.5" right..i was comparing 8 1/4 to 8 1/4..on the chart it says the 7 1/4 are longer than the a-body 8 1/4? so it's be less than 1/2 an inch on each side?..that sounds good right?should i go for it?