They're 1.5" primaries and very cheap..$79. Or should I go with the headman headers?

 

Im using them. The shorty 1 5/8ths primarys ones. I like them alot.

 

1.5" primaries are too small for anything but a stock 305. I have the Hedman 1 5/8" shorties and LOVE them.

 

Summit makes 1 5/8"s primarys too. Thats what Im using. They are basically the smae thing as the hedmans but like $30 cheaper. If you want to be sure about it just go ahead spend the little extra and get the Hedmans.