So I've been planning for a custom front shaft and finally found the splines I think I'll use for the slip. They are from Hub City Spline page , available through dealers on their web page. I've priced out the involute spline 10" long with collar specs-

1 3/8" 21 spline shaft #0332-00385 $52.04
collar to match #0332-00350 $21.86

I haven't ordered them yet & wanted to get the concensus of the board. Do you think the size is OK? The stock splines lok to be 1 1/4" 19 spline. This would come out to 1/3 the price of the NEAPCO setup that fabricator posted part#'s for on pirate, although shorter.