The best replacement for ribosomes is bound ribosomes.

The best alternatives to ribosomes are rated as following:
★★★★★  bound ribosomes
★★★★  attached ribosomes
★★★  80s ribosomes
★★★  free ribosomes
★★★  eukaryotic ribosomes
★★★  endoplasmic reticulum
★★★  prokaryotic ribosomes
★  mitochondria
★  bacterial ribosomes
★  cytoplasm
  bound
  rer ribosome

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Speaking about ribosomes, one probably shouldn't forget about endoplasmic reticulum.

Other search terms related to ribosomes and their ratings are:
★★★★★ endoplasmic reticulum
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ribosomes
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