The RasterSubsetter transformer can also pad a raster with empty (or transparent for RGBA rasters) pixels, if the start column and row are set to 0 and the number of rows and columns are set to the entire raster. The number of rows and columns in any raster can extracted using a RasterPropertyExtractor transformer.
@daveatsafe thanks for the help. I tried down this route but because not all the rasters started out with the same dimensions it was hard to put together. Instead I just created a full extend raster populated with nodata then the rastermosaic to merge with the original content.
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