Welcome to the club. Thats why I'm looking at 1.6TD pistons on 1.5 rods. Oversized 1.5 pistons are currently be cast from unobtainium.There may be some NOS floating around out there. There was a set on the Samba that someone got to befor me.
As for rods, ALL less-than-1.8L engines (and less-than-2.2L I5s) have 136mm rods. All 1.8L engines except the G60 have 144mm rods; G60 has 136. Audi 3A has 144. VW ABA and AEG have 159. All 2.2L I5s have 144mm, except for 10V turbo engines, all of which have 136mm. The Eurovan 10V is an oddball with a different rod that has an enormous wrist pin.