[Wgesnerjr]

Originally Posted by kipps

I have a '87 cluster with one size, and a '91 suburban cluster with the other size. I don't recall which one is which.

I intend to use the '91 cluster(with electronic speedo), but all my bulb holders don't fit it.

Am also interested in any answers to what's going on here.

I have swapped in a 91 cluster and the sockets are smaller than the 85 cluster had originally. So there must have been a change between 85 and 91. But i think they use the same bulb size.

Went to the junk yard and got a handful of each size. Then I just matched the socket to the size of the hole.