Part # = 13110-16500
Part Description = PIPE,INTAKE
Model Count = 12
TM250J 1972 246 TM250 CHAMPION OFF ROAD
TM250K 1973 246 TM250 CHAMPION OFF ROAD
TM250L 1974 246 TM250 CHAMPION OFF ROAD
TM250M 1975 246 TM250 CHAMPION OFF ROAD
TM400J 1972 396 TM400 CYCLONE OFF ROAD
TM400K 1973 396 TM400 CYCLONE OFF ROAD
TM400L 1974 396 TM400 CYCLONE OFF ROAD
TM400M 1975 396 TM400 CYCLONE OFF ROAD
TM400R 1971 396 TM400 CYCLONE OFF ROAD
TS250 1969 246 TS250 SAVAGE DUAL SPORT
TS400J 1972 396 TS400 APACHE DUAL SPORT
TS400K 1973 396 TS400 APACHE DUAL SPORT
so this is a 2 bolt intake manifold? if so have you tried IWT for a uni mikini one? TD hatricks have drawings with bolt spacings etc on their website.
http://www.mikunioz.com/r_m_flanges.htm somewhere i have a better chart though. Also you could make one out of some plate with a short bit of round tube welded to it, then a length of radiator hose, if you have got space lengthwise i guess.