I installed a Progressive Dynamics 9245 in my Argosy and am very happy with it.
Cost around $140.00 on EBay.
Also installed a modern fuse block.
Can't help you with the access though.
I also installed a PD9245 in my 75 TW. I used the old fusebox which was not part of the Univolt. In 75 the Univolt was located in the bathroom closet...
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Richard Wally Byam Airstream Club 7513
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