Teri, we sent your question to Blackinton for their imput, this is what they sent back to us;
They will not fit in the slide bar holders. The 1-3/4" x 3/8" bars are made slightly different than the 1-3/8" x 3/8" bars and will not work with the slide bar holder.
Hope this answers your question, probably not the answer you wanted, sorry.
Answered on 10/23/2015 by bg