TRP - I’m sure there are other viable options for replacement 5” woofers for the BOSE subwoofer box, but you have to look at the speaker ratings closely.
The reason why many folks have landed on using the Morel CAW 538 as a replacement speaker is because this speaker is optimized for a very small “vented” cabinet size. If you look on Parts-Express (
https://www.parts-express.com/morel-caw-538-5-cast-frame-woofer--297-082), you’ll see the CAW 538 will perform optimally with a vented volume of 0.19 cubic ft. That works out to roughly 5.4 liters. The BOSE rear box has a volume of 11 liters. Since there are two 5” woofers you need double the optimal volume (5.4 L * 2 = 10.8 L).
So when considering other options look at their optimum vented volume measurements.
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