While rebuilding my entire rear axle, I nearly got caught short not having a all the spline sockets I needed - M18 for rear wheel bearing bolt, M6 for the ARB drop links & my existing M14 was a bit long for brake caliper carrier upper bolt.
A quick hunt online and I found the Laser 6725 set of low profile splines:
http://www.lasertools.co.uk/product/6725Ebay had them listed for £20, but a quick check on Amazon they were £16 and prime too - price has gone up to £17:
https://www.amazon.co.uk/gp/product/B01MV2UZIX/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1They are split between 1/4, 3/8 and 1/2 inch drive, one piece construction keeps them slim, plus are impact type - not sure I would impact the 1/4 stuff
All my current Halfords advance Spline sockets are 1/2 drive and 2 piece construction making it too big to get in and around inner CV, M14 one makes the upper rear caliper carrier bolt tight to the upper control arm - this set the slim enough to get in around the CV and low profile to improve clearance.
Only negatives I found were: to me the M14 seems a bit light being 3/8 drive -at least for the carrier bolts, would have prefered this being 1/2 to allow me to lean on it properly - and a minor point of the foam holder gets grubby.
All in all its a great set, I would say they are great value at £20 - a bargain if you can get at £17
