I have the following Aquatica items for sale:
18463 Extension Ring $150
18717 Zoom Gear (for Tokina 10-17mm) $80 (barely used)
18731 Zoom Gear (for Tokina 10-17mm with Kenko 1.4X TC) $95 (used once)
Check Aquatica's site here for compatibility: http://www.aquatica.ca/en/products_zoom.html
All items can be found here: https://jimpattersonphotography.com/product-category/used-gear/
All items can be purchased on my site through Paypal. USA and Canada buyers can buy directly on my site (I have secure checkout) with VISA or MC. Shipping is FREE to continental USA. Anywhere else, contact me PRIOR to purchasing for a shipping quote. Thanks!