| 
 | The ornamental design for a roof truss spacer, as shown and described. | |||||||||||||||||
FIG. 1 is a perspective view of the roof truss spacer showing my new design;
FIG. 2 is a front end elevational view thereof;
FIG. 3 is a rear end elevational view thereof;
FIG. 4 is a side elevational view thereof, the side opposite being a mirror image of the side shown in FIG. 4;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
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