I tried to search for where I got them and part number, but can't seem to find it as it was near 4 years ago. Looks like a couple different one's that are candidates to fit and are adjustable. The link I sent is the most likely candidate that I purchased.
I just did a search on Google and found what is out there at best price with trusted company is what I usually do. Normally get this type of stuff from Capt. Harry's, Star Marine Depot, Defender or Jamestown. Just depends on who has them at the time.