I'm not exactly sure what you mean when you say "long" grips but I will take a stab at providing some more info that may be of use.
The D-frame DS 3rd issue of the 70's & 80's (the one with the shroud under barrel) used a wrap around wood grip (stock) that was checkered with no medallion. The grips were in one sense "short."
On the other hand the D-frame Police Positive Special of the late 70"s (around 1977) that also had a shroud under the barrel used a similar set of wood wrap around grips having the same checkering pattern and no medallions. However they were a bit "longer."
So if you are looking for a longer, checkered wood grip that has no medallion and will fit your DS, look for a set of Police Positive Special of the late 70's vintage.
Interesting. Those are in fact the longer grips I was referring to. You may not know that they also came on the detective special. I had one with those grips on it. There is a NIB DS listed on Gunsamerica that also show the longer grips on it. Thanks WS23.