2y sounds like 02y which is a 16v box code.. 26028 is the d.o.m, so yours is 26th of feb 1988. They didn't put the 1st 8 (for the eighties), you have to sort of know the era, ie a 1 would be 91, as they didn't make them in 81.. If you catch my drift.. You can count the splines to help confirm also, think I read the 16v has 28? Splines, which is more than the 8v..