Duster -Gauges and cluster question !!

hi guys !! i add a nice deal last week , i bought 2 5 inch autometer gauges ( mph and rpm ) and 4 others 2 5/8 size ... volt,fuel,water,oil

all in silver pro-com ultralite ,

my question is do you think that the 5 inch ones ( mph ,rpm ) will fit the A-Body Replacement Dash Panel that they sell on ebay ?? is it too big or it would fit perfectly , i know that some of you guys already did it .. and i didnt !!

thx a lot

Joe