Which Reverb for my RP112?

I recently bought a RP112 amp from a guy in Germany on ebay. When I got it, he had a non-standard reverb unit sitting loose in the cabinet. It's made by Cascade (type 271). Here's a photo: http://i244.photobucket.com/albums/gg6/m jet260/MusicMan%20112RP%20-%20as%20obtai ned/DSC00402.jpg
I'm not sure if I have a 65 or a 100 watt model since the logo & model badges were missing from the front of the amp and the serial number isn't readable on the back.
There are two sets of RCA plugs on the bottom of the amp chassis. One set is for the reverb and the other is for the footswitch, but I'm not sure which set is which. One set is closer to the tubes (which is closer to the middle of the chassis) and the other two are further to the right (looking at the amp from the back, on the side where the speaker input jack is).
Could someone tell me which set of RCA input jacks are designed for the reverb? That will at least let me check it to see if it works, and if it doesn't, I'll need to ask for you advice on which reverb unit to buy (and if they used different ones for the 65 and the 100 watt models). Thanks!
P.S. The amp was recovered by a previous owner in aluminum foil (!!!!). I've had it professionally recovered and I've just found a MM logo badge on ebay which I'll install once I receive it. Here are some "before and after" photos:
As obtained: http://i244.photobucket.com/albums/gg6/m jet260/Music_man_original.jpg
Now: http://i244.photobucket.com/albums/gg6/m jet260/MM_amp.jpg

Mike, on my RD100, the reverb connections are closer to the cabinet, the switch connections are close to the middle.
My tank is the little, medium delay Accutronics, 8FB2A1B. I plan to change it to the full size, long delay, 4FB3A1B.

Thanks for the reply, Bill. I'll give it a shot over the weekend!

It may be that the earlier models used the OC Electronics tank. I believe they were bought by Accutronics so they would have a small tank availlable.
(Some used to have a sticker that said "made by beautiful Wisconsin girls")