21710298 Volvo Fuel Cooler. Same as 858541. This part is used as both a fuel cooler and as a power steering cooler. And sometimes on the same engine (KAMD42P as an example). This is a drop in replacement. Take yours out and put this one in. All connections and dimensions are equivalent to the OEM unit. 2” Dia Shell 6” 10.5” OAL 3.75” Center -3/8 Hose Bib 1.25 Hose 1/8" NPT Compatible with the following Diesel Engines: KAD42P-A, KAMD42P-A, HS1A, KAD32P, TAMD42WJ-A, KAD43P-A, KAMD43P, KAMD43P-A, KAMD43P-B, KAD44P, KAD44P-B, KAD44P-C, KAMD44P-A, KAMD44P-C, KAD300-A, KAMD300-A, HS1A, HS1E-A, KAMD44P-B AD31L-A, AD31P-A, AD41L-A, AD41P-A, D41L-A, TAMD31L-A, TAMD31M-A, TAMD31P-A, TAMD31S-A, TAMD41H-A, TAMD41H-B, TAMD41P-A, TAMD41L-A, TAMD41M-A, TMD31L-A, TMD41L-A, TAMD31S, HS1A, TAMD31L, TAMD31P, TAMD41P MD40A, TMD40A, TMD40B, TMD40C, AQD40A, TAMD40A, TAMD40B, AD40B, AQAD40A, AQAD40B MD31A, TMD31A, TMD31B, TAMD31A, TAMD31B, AD31, AQAD31A, AD31B, 290A, DP-A, DP-B, DP-A1, DP-B1, SP-A, SP-A1 TMD41A, TMD41B, D41A, D41B, TAMD41A, TAMD41B, AQAD41A, AD41A, AD41B, 290A, DP-A, DP-B, DP-A1, DP-B1, SP-A, SP-A1, AD41BJ, AD41, AD41P-B, D41, TAMD41M-A MD31A, TMD31B, TAMD31B, AD31B TMD41B, D41B, TAMD41B, AD41B, AD41BJ, KAD42A, KAMD42A, HS1A, MS5B AD31D, AD31D-A, AD31XD, TAMD31D, TMD31D, AD41D, D41D, TAMD41D, TMD41D, HS1A, KAD42B, KAMD42B, TAMD42B, MD22L, MD22P, MD22L-B, MD22P-B, TMD22-B, TMD22P-C, TAMD22P-B, HS25A, HS25A-B, 120S-E, MS2A-E, MS2L-E, MS2B-L, TMD22B Gasoline Engines: 740A, BB740A