Humminbird fishfinder

Advice
#1 
I have used a Humminbird 170 with a through the hull transducer on my Ocean Kayak for several years. I need to replace it and the 170 model is discontinued.   Is there another model Humminbird fishfinder that can use my existing setup?
#2

Humminbird
Though there may be some who can answer this here, you might be better off asking this question on a fishing specific forum, or better yet from a Humminbird dealer, or best yet, from Humminbird themselves.

#3

one left here

– Last Updated: Jun-21-15 6:05 AM EST –

http://smile.amazon.com/Humminbird-PiranhaMAX-Waterproof-Discontinued-Manufacturer/dp/B001DTUTJ4/ref=smi_www_rco2_go_smi_g2096965862?_encoding=UTF8&*Version*=1&*entries*=0

Also, this site will probably answer your transducer connection question. I noticed a "support" link up top.
http://www.humminbird.com/Freshwater/Product-Category/Accessories/Transducers/

Gee, you're taking me way back to when, as a not so "proper yachtsman", I installed a humminbird on my sailboat. 1/4 the price and 4 times the features of the Brookes and Gatehouse sounder that came with my next boat...