[USA, GA] Need STL file slightly modified then print 3 piece

File to be modified https://www.thingiverse.com/thing:5413969

The spec for the one linked is for a 62 x 44.8 x 11 (mm) radiator. I need it to fit on a 48.8mm wide instead of 44.8mm. one of the legs just needs to be pushed out 4mm further. The square shape needs to stay the same.

Image to illustrate measurement I'm talking about : https://imgur.com/a/PW0Sb9O

Material color black / PETG