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So, checking in CVI's (invaluable catalog) the part numbers are 673773/673774 for the correct backing plates. What other bits would one need? This is beginning to seem like a whole lot more gathering than I bargained for when I found this dual master. Looks like I should be trying to find a dead late 1800E/ES to snag what I'd need.

Has anyone done this? Can anyone who's experienced both a single circuit 122 and late (69'70) 122 or early and late 1800 share their thoughts/feelings about the merit of single vs. dual diagonal? Maybe I just rebuild and hold on to this master for a bit.

I gotta think that many more Swedes with pre 69 122 made this mod, as all 69/70 122 were set up this way. And none of that production came here via dealers.

BTW, I posted a general question on a CVI 122 forum about the then available aftermarket/modifications outside the US, to get some idea of what that local market (granted it was small, but what other country with a population of under 10 million do you know of tha manufactures 2 lines of automobiles?) came up with for the 122. Mikael's got the site down for a few days so I can't see if there's been any response.