First, the sear spring definitely is a V (or J) shape; the short end acts as the magazine catch spring and the grip safety spring. If the one they sent you is straight, it is either broken or the wrong spring, so return it for the correct one. Make sure to refer to their Key # 23, Item # 167960.
IIRC, the grip safety does indeed sit under the sear, but the sear has sort of a shallow upside down U shape so that when the grip safety is pushed in, its tip moves into that hollow and allows the sear to move down, releasing the firing pin.
HTH
Jim
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