Spare Tire to Trunk Floor Separator

I'm looking for the spare tire board (trunk floor) for a '92 SVX. The one in my car got wet to the point of collapsing. In a momentary lapse of reason, I threw it out before I measured it to make a new one. Does anyone have one from a parts car that they would be willing to ship to zip code 48067? Or would you make a tempate of one so I could buy some Masonite and make a new one? Any help is appreciated.