Polish and Bulgarian OOBs

[Pibwl]

As for Bulgaria, I've just found an article, that they modified MiG-17F to carry 4x 250 kg bombs (twice as many as unit 390) and used them from 1970 until 1986. Regular unit 390 was used at least until 1969 then.

Alternatively, at least 2 UB-16-57 rocket pods could have been carried (2x16 rockets ie. 2x weapon 186 4x57 mm rockets x 4)

399, 400 MiG-23 - should be attack MiG-23B variant, used no earlier than mid-1976 (now 1973)

[Pibwl]

One more thing: it seems, that at least late MiG-17s used in attack regiments were camouflaged (photo in an article), so icon 2907 is the best.

(On the other hand: precise parachute bombs (which I guess is weapon PB-250 of unit 392 MiG-17PF and 404 Su-25) were rather very uncommon in Eastern Bloc...)