They show up on eBay from time to time. That's where I got my last one along with a CFS copper brass radiator. You can use a 89 to 92 shroud in the earlier cars even though they only have one auxiliary fan. That's what I have. It took me a long time to know that there was a lower strip and clips. I found one in a parts yard years ago. Here are some part numbers
Fan Shrouds
16711-42010 Main shroud (86.5-88)
16711-42060 Main shroud (89-92)
16702-42010 Lower (No.2) shroud (thin strip held on by 2 clips)