Fuse Holder - Push In Cap - 12 Volt 10 Amp  
SeaDog 420501-1 

Dimensions are as follows - (See Picture 2 for reference) 
A = 1/4"    B = 9/16"   

Release Location - Side  Volts - 12  Amps - 10 Max 

Stamped Brass/Molded Bakelite