Having sold my Seatool/D-300 I have a dual mount Subsee setup including +5 and +10 diopters. The mount was custom made by Subsee for a Seatool 60 or 105 port. Measuring the diameter at 3 5/8". (No gurantees on my measuring abilities. You may need to contact Subsee for a ring that fits your port)
Make an offer.
Tom
