Nice burn out
If you want, look for 145/70 R12 - they appear better, but also more stability (on theory) - it's 1cm lower and wider. Maybe the best size over original rim 4J12 (but yours are 3,5J12...!? So... Well, sorry about this blah-blah of mine
wanted to be helpful).
About the fan, there are tin and plastic washer on both sides, the plastic ones are inside. A friend of mine had problems with the fan, those were missing- he took it like this from Poland (went there by bus just to buy a 126, cos his old one became real crap). Then the fan turned around the base...
A friend of ours "cleverly" welded them together (no comment). But of course the bearing died (it was a new one). Then he bought a brand new fan and I took care to put all together. You can see the handmade washers shaped after my original once. The tin is 0,7mm and the plastic (not a hard one) the most suitable you can find in the garage. Well, it was perfect till the next alternator problem. I wasn't around, so that guy "helped" again. For some reason he couldn't put them together, removed the washers on one side, said "you don't need this!" and as a result not that late, he had to weld the brand new fan just like the old one. Now I wanna kill him, but he's a nice guy to drink beer with.
If you can imagine, he earns his bread as a car mechanic..., poor cars
And there are more "funny" stories...
Regards!