All cossies amd 4I's deffo came with speaker holes, if you have either and it dont have a speaker hole its not the origional dash. every mk1 sierra ive ever seen has the speaker hole in the centre of the dash, to me this dashj looks like a very earkly mk2 dash, the mk's came out in 1987 didnt they??We used to have a saph 2.0 gl and it was a d reg