The SRT suspension is shared with the nitro rustler the only thing the slash and SRT share is the rear a-arms. I would get titanium hinge pins bc the material traxxas uses is very weak. The slash hinge pin kit will work with an exception to the front caster block(where is attaches to the outer a arm) and steering spindle( where the pins goes through the front axle) as the SRT uses thicker hinge pins there (has harry already stated haha). You can purchase the size you need off of Lunsford but the stock ones in this area seem to not bend very easily especially when you upgrade to a rd logic aluminium caster block. If you want upgrade anything for the nitro rustler with work( only the non nitro stuff of course haha).
Btw this is the size and number of hinge pins you'll need for the SRT and should be available from Lunsford.
hinge pins 1/8"
44mm x2 front bulkhead pin
50mm x2 rear suspension mount pin
26mmx2 steering king pin
31.5mm x4 outer front and rear a arm pin