Hi Lam, On mine, the half shaft came out fairly easily. Didn't need a puller. Yes, seals are the same. Bought mine from eBay new old stock, but Chris at Redline should have them. Bearings are also all the same. I had the 1/4" keyway HS on the car and luckily my spare matched. Don't think it matters so long as the hub and keyway sizes match the slot in the HS. Had a local engineering firm press off the old bearings and press on the new one. Charged me £60 per side. Bearing must be pressed on to the correct depth from the HS end. Clive