Norman Gruss
Hm, like the same Kit with the new cockpit. flankers-site.co.uk/yak-38.htm at the end of the site. The rear on the original pics, looks like the same length with the normal Yak-38

Bill Gilman
I found this nice review of the Yak-38U kit, they did indeed forget to lengthen the rear fuselage. Someone will come up with a resin plug I'm sure!

britmodeller.com/for..?showtopic=234910610