Hypoallergenic domes

Does anyone know where to purchase hypoallergenic domes/tips for my SIE aids?

My America Hears SIE’s work best with a small standard dome that came with the package. However I have a reaction to the materials and cannot wear the tips for more than a half hour. I had custom hypoallergenic mold tips made but they cause too much occusion even when completely vented. Does anyone know where to order replacement typoallergenic tips? America Hears is saying they cannot be had!