No longer available. 

Try 503083 for internal replacement OR 9350122 Weather Shield 

   OR 

Use lattice or wood shim and slide into the cavity where this latch slides in.

Then screw down surface mount tilt latch 503028 to the top of the sash

Concealed Internal Tilt-In latch, - White SH Window Narrow - Pair in White.

Internal Tilt latch for Single Hung Vinyl Window with Snap in finger pull.
4-7/8 Inches long
1/2 inch wide
5/16 inch thick

Left and Right Handed.

Priced and sold in pairs.