Product Overview 2-Prong Thermal Flasher – FL577 2-Prong Round Extra Loud Turn-Signal Flasher. Individually packaged in carded blister pack. FITMENT NOTE This is commonly used to replace a #552 / 536 flasher if extra loudness is desired, and if the extra space is available to accomodate this flasher (which is taller than the #552/536). If your vehicle originally came with a short #552/536 flasher, PLEASE CHECK first to make sure that you have the additional space required to accomodate this unit. Replaces Ideal 577 Littelfuse FLR577 Please review the specifications for suitable wiring harness or mounting bracket. Reviews (No reviews yet) Write a Review