THANK U All! I was worry very much that all that effords do bring engine from us to poland is done for nothing and i will need to deal with customs again:)
I think to replace swing arm for disk brakes but it looks like frame has to be chnged also. Not because of the rear brake cylinder but because rear shock. If i use rear swing arm from after 1990 then i shoul use shock from that year. I got that one and i try it once but there is very litlle (1mm!) space between frame and the spring.
What do U think guys?