Your 20 yr old Atwood is behind the eight ball.......
The 'bolt on' electric element/with attached t-stats was no longer used AFTER your model year (1996)---screw in elements were the new thing
Then in 2004 Atwood did a complete design change ....DC Controls for both electric/propane functions (just one set of t-stats/DC circuit board/controls)
Electric is triggered by DC Relay
In 2006 ALL T&P Relief Valves are 3/4" vs the 1/2" versions
So you can replace that OLD out of date Atwood with a NEW Version Combo Unit ---- will just need to do some wiring addition/modifications
10 gal will fit in same space as old 10 gal
Time to come into the 21st Century
Pgs 23,24,25 explain the necessary conversions......
http://www.atwoodmobile.com/dealer-m...atermanual.pdf
Atwood GC10A-4E on sale/free shipping (ends 3/23/2018)
https://www.pplmotorhomes.com/parts/...gallon_80-1356