an update about my SC18 project.
While i was building my SC18 i found a great servo i've around that i wasn't able to use in other cars i have because of the weird spline size,no servo saver fit at all.I tried it in the SC18 servo saver just to realize if it was possible to fit it in this truck and. . . IT DOES! Also,the screw on the stock servo fits perfectly into the spline,this means non servo savers to look for and non weird screw sizes like in Hitek micro Servos= DIRECT FIT
This is the servo: http://www.savoxtech.com.tw/sh-0257.htm

Actually the only mod to do ,in order to have it perfectly fitted,is a 1,5/2mm. shave on the servo plastic holder cause the servo case size is slightly larger,nothing hard to do.
I cannot find the picture anymore but here's a link of a thread i started in another Forum in wich you can see the Savox servo fitted in the chassis.
http://www.h8ita.net/forum/viewtopic...=1082&start=50