Big blocks came with Group 27. Those 2 vendors have many complaints about them. Do some research before ordering. I need a new Red cap battery too, but there are no reliable sources. I looked those 2 up and you won't believe how many 1 star ratings. You can check other forums and find the same problems. There is talk about a vendor taking them up again, but all I hear are delays. If anyone here knows of a reliable seller, please speak.