Wossner only list 430 pistons 84-88 , 8051D... But I see well known suppliers (Husqvarna-Parts, HusqvarnaVintage & HVA) show Wossner pistons for years 81-88. I think they may be the same pistons but the barrel machining tolerances are different, air vs water cooled. Husqvarna Mahle pistons , 1611781-01,2,3 , seem to cover all 430s. Opinions?