yamaha4evr
New member
I ordered some slp rail extns and just got them today i ordered the ones for a 121-136 extn and ordered the part number i needed. I get them out of the package and the item number is correct but the label and instructions say 141-151 extn. So my questions is, is their a way to measure the extn itself to make sure this is the right one? cause the part number is good but they are saying its a 141-151?
yes you can measure them. 121-136 should be right at 7.5". 141-151 would be closer to 5". in some applications, the numbers will be smaller to account for adjustments for smaller drivers, but those should get you close.