Just doing a google search, I found these listed below. Are you planning to install it yourself or have a upholestry shop do it? If its a shop, they probably have sources to get it from as well. We have a couple members on here with convertibles....
Ragged89 and Robertmee. May pm them as well if they dont respond to this post....

https://www.convertibletopguys.com/c...-Dakota-Pickup

https://www.topsonline.com/model/Con...ta_Pickup.html