I have only provided input concerning the legs. I have no experience with rotating the entire leg from the chassis.
anyone else can help choose which servo to buy and how many should be changed ?, ill stick to my paper and pen for now and apply what i learned in physics 
Hi,
You don’t necessarily need to buy new servos. But to make your quad walk I would suggest to remove the 4. DOF (the servos inside the body), that would also save some weight. Then make a new upper and lower body section for supporting the coxa servo on both sides. Decrease the femur length as much as possible, maybe 50-40 mm length, its hard to say without not knowing the exact weight of the robot. Also, analyze every part/bracket to see if you can decrease the weight, e.g. drill some holes on the tibia, reduce the length on every screw that holds the servos. Use an accurate weight scale for measuring the main parts before and after doing the modifications for reducing the weight.
Good luck! 
hmm, drilling wholes would be a good idea to reduce weight, but unfortunatly, i cant remove the servos in the middle of the body since they’re the whole idea of why im making this robot x) , thanks for the tips though
I’m starting to think of making another design with 3DOF and same 225 servos, ill keep the current one and work on it later. I dont want to go more off topic so ill make a thread for it in the project section as soon as finish the drawings in autocad. Thank you all for the valueable help you gave me in this thread, ill see you later on the other one 8)