Used Harken Through Deck Stainless Steel Double Wheel Block with plate.  Center to center hole measurement is 2 5/8", total length of plate is 3 5/8". Works for 1/4" line or less. 

The block is in good used condition. I have several Harken Blocks and other sail boat parts available. Check out my eBay Store.

I will be listing more in the next few days. I combine multiple winning auctions to save you shipping costs. 

Winning bidder pays by Paypal within 8 hours after the close of the auction. Bid with confidence see my 1665+ positive feedbacks!