Is the mk5a just the early mk5 with the slatted grill, 1990 to 1992?

IIRC in terms of variations of looks, there was the first one with slatted grill then this one with the oval 'mouth' lol then it changed to the smooth one piece headlight mk6.


Reason i ask all this is i'm trying to find what clutch release bearing to use for a ib5 box using a rst ap clutch and some have quoted on various threads a mk5b change over year, hence this thread lol