got a walkera brushless motor for my 36 but it is the medium size and just barely fits. the short one is 10mm less in length. i got the longer one to fit but it is very tight. will this be a problem? will it make the frame weaker or stonger in a crash? it is still a 380 brushless just longer , will performance be any different? any and all opinions are appreciated.

also had a bad experience with hobby e-store. they are in the U.S.A. but still order their parts from asia.